added still image support

Originally committed as revision 1439 to svn://svn.ffmpeg.org/ffmpeg/trunk

6 files changed, 716 insertions, 758 deletions

diff --git a/libavformat/Makefile b/libavformat/Makefile
index 091fecf..d688d70 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -12,9 +12,13 @@ OBJS= utils.o cutils.o allformats.o
 
 # mux and demuxes
 OBJS+=mpeg.o mpegts.o ffm.o crc.o img.o raw.o rm.o asf.o \
-      avienc.o avidec.o wav.o swf.o au.o gif.o mov.o jpeg.o dv.o framehook.o
+      avienc.o avidec.o wav.o swf.o au.o gif.o mov.o jpeg.o dv.o \
+      yuv4mpeg.o
+# image formats
+OBJS+= pnm.o yuv.o
 # file I/O
 OBJS+= avio.o aviobuf.o file.o 
+OBJS+= framehook.o 
 
 ifeq ($(BUILD_STRPTIME),yes)
 OBJS+= strptime.o
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index 8a65638..98702e4 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -45,6 +45,8 @@ void av_register_all(void)
     mov_init();
     jpeg_init();
     dv_init();
+
+    av_register_output_format(&yuv4mpegpipe_oformat);
     
 #ifdef CONFIG_VORBIS
     ogg_init();
@@ -60,6 +62,14 @@ void av_register_all(void)
     audio_init();
 #endif
 
+    /* image formats */
+    av_register_image_format(&pnm_image_format);
+    av_register_image_format(&pbm_image_format);
+    av_register_image_format(&pgm_image_format);
+    av_register_image_format(&ppm_image_format);
+    av_register_image_format(&pgmyuv_image_format);
+    av_register_image_format(&yuv_image_format);
+
     /* file protocols */
     register_protocol(&file_protocol);
     register_protocol(&pipe_protocol);
diff --git a/libavformat/img.c b/libavformat/img.c
index 6afcb4e..70f6307 100644
--- a/libavformat/img.c
+++ b/libavformat/img.c
@@ -19,22 +19,6 @@
 #include <unistd.h>
 #include "avformat.h"
 
-extern AVInputFormat pgm_iformat;
-extern AVOutputFormat pgm_oformat;
-extern AVInputFormat pgmyuv_iformat;
-extern AVOutputFormat pgmyuv_oformat;
-extern AVInputFormat ppm_iformat;
-extern AVOutputFormat ppm_oformat;
-extern AVInputFormat imgyuv_iformat;
-extern AVOutputFormat imgyuv_oformat;
-extern AVInputFormat pgmpipe_iformat;
-extern AVOutputFormat pgmpipe_oformat;
-extern AVInputFormat pgmyuvpipe_iformat;
-extern AVOutputFormat pgmyuvpipe_oformat;
-extern AVInputFormat ppmpipe_iformat;
-extern AVOutputFormat ppmpipe_oformat;
-extern AVOutputFormat yuv4mpegpipe_oformat;
-
 #ifdef __MINGW32__
 #  include <windows.h>
 #  define usleep(t)    Sleep((t) / 1000)
@@ -46,266 +30,45 @@ extern AVOutputFormat yuv4mpegpipe_oformat;
 #  endif
 #endif
 
-#define IMGFMT_YUV     1
-#define IMGFMT_PGMYUV  2
-#define IMGFMT_PGM     3
-#define IMGFMT_PPM     4
-#define IMGFMT_YUV4MPEG     5
-
-#define Y4M_MAGIC "YUV4MPEG2"
-#define Y4M_FRAME_MAGIC "FRAME"
-#define Y4M_LINE_MAX 256
-
 typedef struct {
     int width;
     int height;
     int img_number;
     int img_size;
-    int img_fmt;
+    AVImageFormat *img_fmt;
+    int pix_fmt;
     int is_pipe;
-    int header_written;
     char path[1024];
+    /* temporary usage */
+    void *ptr;
 } VideoData;
 
 int emulate_frame_rate;
 
-static inline int pnm_space(int c)  
-{
-    return (c==' ' || c=='\n' || c=='\r' || c=='\t');
-}
-
-static void pnm_get(ByteIOContext *f, char *str, int buf_size) 
-{
-    char *s;
-    int c;
-    
-    do  {
-        c=get_byte(f);
-        if (c=='#')  {
-            do  {
-                c=get_byte(f);
-            } while (c!='\n');
-            c=get_byte(f);
-        }
-    } while (pnm_space(c));
-    
-    s=str;
-    do  {
-        if (url_feof(f))
-            break;
-        if ((s - str)  < buf_size - 1)
-            *s++=c;
-        c=get_byte(f);
-    } while (!pnm_space(c));
-    *s = '\0';
-}
-
-static int pgm_read(VideoData *s, ByteIOContext *f, UINT8 *buf, int size, int is_yuv)
-{
-    int width, height, i;
-    char buf1[32];
-    UINT8 *picture[3];
-
-    width = s->width;
-    height = s->height;
-
-    pnm_get(f, buf1, sizeof(buf1));
-    if (strcmp(buf1, "P5")) {
-        return -EIO;
-    }
-    pnm_get(f, buf1, sizeof(buf1));
-    pnm_get(f, buf1, sizeof(buf1));
-    pnm_get(f, buf1, sizeof(buf1));
-    
-    picture[0] = buf;
-    picture[1] = buf + width * height;
-    picture[2] = buf + width * height + (width * height / 4);
-    get_buffer(f, picture[0], width * height);
-    
-    height>>=1;
-    width>>=1;
-    if (is_yuv) {
-        for(i=0;i<height;i++) {
-            get_buffer(f, picture[1] + i * width, width);
-            get_buffer(f, picture[2] + i * width, width);
-        }
-    } else {
-        for(i=0;i<height;i++) {
-            memset(picture[1] + i * width, 128, width);
-            memset(picture[2] + i * width, 128, width);
-        }
-    }
-    return 0;
-}
-
-static int ppm_read(VideoData *s, ByteIOContext *f, UINT8 *buf, int size)
-{
-    int width, height;
-    char buf1[32];
-    UINT8 *picture[3];
-
-    width = s->width;
-    height = s->height;
-
-    pnm_get(f, buf1, sizeof(buf1));
-    if (strcmp(buf1, "P6")) {
-        return -EIO;
-    }
-    
-    pnm_get(f, buf1, sizeof(buf1));
-    pnm_get(f, buf1, sizeof(buf1));
-    pnm_get(f, buf1, sizeof(buf1));
-    
-    picture[0] = buf;
-    get_buffer(f, picture[0], width * height*3);
-    
-    return 0;
-
-}
-
-static int yuv_read(VideoData *s, const char *filename, UINT8 *buf, int size1)
-{
-    ByteIOContext pb1, *pb = &pb1;
-    char fname[1024], *p;
-    int size;
-
-    size = s->width * s->height;
-    
-    strcpy(fname, filename);
-    p = strrchr(fname, '.');
-    if (!p || p[1] != 'Y')
-        return -EIO;
-
-    if (url_fopen(pb, fname, URL_RDONLY) < 0)
-        return -EIO;
-    
-    get_buffer(pb, buf, size);
-    url_fclose(pb);
-    
-    p[1] = 'U';
-    if (url_fopen(pb, fname, URL_RDONLY) < 0)
-        return -EIO;
-
-    get_buffer(pb, buf + size, size / 4);
-    url_fclose(pb);
-    
-    p[1] = 'V';
-    if (url_fopen(pb, fname, URL_RDONLY) < 0)
-        return -EIO;
-
-    get_buffer(pb, buf + size + (size / 4), size / 4);
-    url_fclose(pb);
-    return 0;
-}
-
-static int img_read_packet(AVFormatContext *s1, AVPacket *pkt)
+static int image_probe(AVProbeData *p)
 {
-    VideoData *s = s1->priv_data;
-    char filename[1024];
-    int ret;
-    ByteIOContext f1, *f;
-    static INT64 first_frame;
-
-    if (emulate_frame_rate) {
-        if (!first_frame) {
-            first_frame = av_gettime();
-        } else {
-            INT64 pts;
-            INT64 nowus;
-
-            nowus = av_gettime() - first_frame;
-
-            pts = ((INT64)s->img_number * FRAME_RATE_BASE * 1000000) / (s1->streams[0]->codec.frame_rate);
-
-            if (pts > nowus)
-                usleep(pts - nowus);
-        }
-    }
-
-/*
-    This if-statement destroys pipes - I do not see why it is necessary
-    if (get_frame_filename(filename, sizeof(filename),
-                           s->path, s->img_number) < 0)
-        return -EIO;
-*/
-    get_frame_filename(filename, sizeof(filename),
-                       s->path, s->img_number);
-    if (!s->is_pipe) {
-        f = &f1;
-        if (url_fopen(f, filename, URL_RDONLY) < 0)
-            return -EIO;
-    } else {
-        f = &s1->pb;
-        if (url_feof(f))
-            return -EIO;
-    }
-
-    av_new_packet(pkt, s->img_size);
-    pkt->stream_index = 0;
-
-    switch(s->img_fmt) {
-    case IMGFMT_PGMYUV:
-        ret = pgm_read(s, f, pkt->data, pkt->size, 1);
-        break;
-    case IMGFMT_PGM:
-        ret = pgm_read(s, f, pkt->data, pkt->size, 0);
-        break;
-    case IMGFMT_YUV:
-        ret = yuv_read(s, filename, pkt->data, pkt->size);
-        break;
-    case IMGFMT_PPM:
-        ret = ppm_read(s, f, pkt->data, pkt->size);
-        break;
-    default:
-        return -EIO;
-    }
-    
-    if (!s->is_pipe) {
-        url_fclose(f);
-    }
-
-    if (ret < 0) {
-        av_free_packet(pkt);
-        return -EIO; /* signal EOF */
-    } else {
-        pkt->pts = ((INT64)s->img_number * s1->pts_den * FRAME_RATE_BASE) / (s1->streams[0]->codec.frame_rate * s1->pts_num);
-        s->img_number++;
+    if (filename_number_test(p->filename) >= 0)
+        return AVPROBE_SCORE_MAX;
+    else
         return 0;
-    }
 }
 
-static int sizes[][2] = {
-    { 640, 480 },
-    { 720, 480 },
-    { 720, 576 },
-    { 352, 288 },
-    { 352, 240 },
-    { 160, 128 },
-    { 512, 384 },
-    { 640, 352 },
-    { 640, 240 },
-};
-
-static int infer_size(int *width_ptr, int *height_ptr, int size)
+static int read_header_alloc_cb(void *opaque, AVImageInfo *info)
 {
-    int i;
+    VideoData *s = opaque;
 
-    for(i=0;i<sizeof(sizes)/sizeof(sizes[0]);i++) {
-        if ((sizes[i][0] * sizes[i][1]) == size) {
-            *width_ptr = sizes[i][0];
-            *height_ptr = sizes[i][1];
-            return 0;
-        }
-    }
-    return -1;
+    s->width = info->width;
+    s->height = info->height;
+    s->pix_fmt = info->pix_fmt;
+    /* stop image reading but no error */
+    return 1;
 }
 
 static int img_read_header(AVFormatContext *s1, AVFormatParameters *ap)
 {
     VideoData *s = s1->priv_data;
-    int i, h;
+    int i, ret;
     char buf[1024];
-    char buf1[32];
     ByteIOContext pb1, *f = &pb1;
     AVStream *st;
 
@@ -315,6 +78,9 @@ static int img_read_header(AVFormatContext *s1, AVFormatParameters *ap)
         return -ENOMEM;
     }
 
+    if (ap && ap->image_format)
+        s->img_fmt = ap->image_format;
+
     strcpy(s->path, s1->filename);
     s->img_number = 0;
 
@@ -324,20 +90,6 @@ static int img_read_header(AVFormatContext *s1, AVFormatParameters *ap)
     else
         s->is_pipe = 1;
         
-    if (s1->iformat == &pgmyuvpipe_iformat ||
-        s1->iformat == &pgmyuv_iformat)
-        s->img_fmt = IMGFMT_PGMYUV;
-    else if (s1->iformat == &pgmpipe_iformat ||
-             s1->iformat == &pgm_iformat)
-        s->img_fmt = IMGFMT_PGM;
-    else if (s1->iformat == &imgyuv_iformat)
-        s->img_fmt = IMGFMT_YUV;
-    else if (s1->iformat == &ppmpipe_iformat ||
-             s1->iformat == &ppm_iformat)
-        s->img_fmt = IMGFMT_PPM;
-    else
-        goto fail;
-
     if (!s->is_pipe) {
         /* try to find the first image */
         for(i=0;i<5;i++) {
@@ -353,43 +105,9 @@ static int img_read_header(AVFormatContext *s1, AVFormatParameters *ap)
         f = &s1->pb;
     }
     
-    /* find the image size */
-    /* XXX: use generic file format guessing, as mpeg */
-    switch(s->img_fmt) {
-    case IMGFMT_PGM:
-    case IMGFMT_PGMYUV:
-    case IMGFMT_PPM:
-        pnm_get(f, buf1, sizeof(buf1));
-        pnm_get(f, buf1, sizeof(buf1));
-        s->width = atoi(buf1);
-        pnm_get(f, buf1, sizeof(buf1));
-        h = atoi(buf1);
-        if (s->img_fmt == IMGFMT_PGMYUV)
-            h = (h * 2) / 3;
-        s->height = h;
-        if (s->width <= 0 ||
-            s->height <= 0 ||
-            (s->width % 2) != 0 ||
-            (s->height % 2) != 0) {
-            goto fail1;
-        }
-        break;
-    case IMGFMT_YUV:
-        /* infer size by using the file size. */
-        {
-            int img_size;
-            URLContext *h;
-
-            /* XXX: hack hack */
-            h = url_fileno(f);
-            img_size = url_seek(h, 0, SEEK_END);
-            if (infer_size(&s->width, &s->height, img_size) < 0) {
-                goto fail1;
-            }
-        }
-        break;
-    }
-    
+    ret = av_read_image(f, s1->filename, s->img_fmt, read_header_alloc_cb, s);
+    if (ret < 0)
+        goto fail1;
 
     if (!s->is_pipe) {
         url_fclose(f);
@@ -397,18 +115,13 @@ static int img_read_header(AVFormatContext *s1, AVFormatParameters *ap)
         url_fseek(f, 0, SEEK_SET);
     }
     
-
     st->codec.codec_type = CODEC_TYPE_VIDEO;
     st->codec.codec_id = CODEC_ID_RAWVIDEO;
     st->codec.width = s->width;
     st->codec.height = s->height;
-    if (s->img_fmt == IMGFMT_PPM) {
-        st->codec.pix_fmt = PIX_FMT_RGB24;
-        s->img_size = (s->width * s->height * 3);
-    } else {
-        st->codec.pix_fmt = PIX_FMT_YUV420P;
-        s->img_size = (s->width * s->height * 3) / 2;
-    }
+    st->codec.pix_fmt = s->pix_fmt;
+    s->img_size = avpicture_get_size(s->pix_fmt, s->width, s->height);
+
     if (!ap || !ap->frame_rate)
         st->codec.frame_rate = 25 * FRAME_RATE_BASE;
     else
@@ -423,159 +136,111 @@ static int img_read_header(AVFormatContext *s1, AVFormatParameters *ap)
     return -EIO;
 }
 
-static int img_read_close(AVFormatContext *s1)
+static int read_packet_alloc_cb(void *opaque, AVImageInfo *info)
 {
+    VideoData *s = opaque;
+
+    if (info->width != s->width ||
+        info->height != s->height)
+        return -1;
+    avpicture_fill(&info->pict, s->ptr, info->pix_fmt, info->width, info->height);
     return 0;
 }
 
-/******************************************************/
-/* image output */
-
-static int pgm_save(AVPicture *picture, int width, int height, ByteIOContext *pb, int is_yuv) 
+static int img_read_packet(AVFormatContext *s1, AVPacket *pkt)
 {
-    int i, h;
-    char buf[100];
-    UINT8 *ptr, *ptr1, *ptr2;
-
-    h = height;
-    if (is_yuv)
-        h = (height * 3) / 2;
-    snprintf(buf, sizeof(buf), 
-             "P5\n%d %d\n%d\n",
-             width, h, 255);
-    put_buffer(pb, buf, strlen(buf));
-    
-    ptr = picture->data[0];
-    for(i=0;i<height;i++) {
-        put_buffer(pb, ptr, width);
-        ptr += picture->linesize[0];
-    }
+    VideoData *s = s1->priv_data;
+    char filename[1024];
+    int ret;
+    ByteIOContext f1, *f;
+    static INT64 first_frame;
 
-    if (is_yuv) {
-        height >>= 1;
-        width >>= 1;
-        ptr1 = picture->data[1];
-        ptr2 = picture->data[2];
-        for(i=0;i<height;i++) {
-            put_buffer(pb, ptr1, width);
-            put_buffer(pb, ptr2, width);
-            ptr1 += picture->linesize[1];
-            ptr2 += picture->linesize[2];
+    if (emulate_frame_rate) {
+        if (!first_frame) {
+            first_frame = av_gettime();
+        } else {
+            INT64 pts;
+            INT64 nowus;
+
+            nowus = av_gettime() - first_frame;
+
+            pts = ((INT64)s->img_number * FRAME_RATE_BASE * 1000000) / (s1->streams[0]->codec.frame_rate);
+
+            if (pts > nowus)
+                usleep(pts - nowus);
         }
     }
-    put_flush_packet(pb);
-    return 0;
-}
 
-static int ppm_save(AVPicture *picture, int width, int height, ByteIOContext *pb) 
-{
-    int i;
-    char buf[100];
-    UINT8 *ptr;
+    if (!s->is_pipe) {
+        if (get_frame_filename(filename, sizeof(filename),
+                               s->path, s->img_number) < 0)
+            return -EIO;
+        f = &f1;
+        if (url_fopen(f, filename, URL_RDONLY) < 0)
+            return -EIO;
+    } else {
+        f = &s1->pb;
+        if (url_feof(f))
+            return -EIO;
+    }
 
-    snprintf(buf, sizeof(buf), 
-             "P6\n%d %d\n%d\n",
-             width, height, 255);
-    put_buffer(pb, buf, strlen(buf));
-    
-    ptr = picture->data[0];
-    for(i=0;i<height;i++) {
-        put_buffer(pb, ptr, width * 3);
-        ptr += picture->linesize[0];
+    av_new_packet(pkt, s->img_size);
+    pkt->stream_index = 0;
+
+    s->ptr = pkt->data;
+    ret = av_read_image(f, filename, s->img_fmt, read_packet_alloc_cb, s);
+    if (!s->is_pipe) {
+        url_fclose(f);
     }
 
-    put_flush_packet(pb);
-    return 0;
+    if (ret < 0) {
+        av_free_packet(pkt);
+        return -EIO; /* signal EOF */
+    } else {
+        pkt->pts = ((INT64)s->img_number * s1->pts_den * FRAME_RATE_BASE) / (s1->streams[0]->codec.frame_rate * s1->pts_num);
+        s->img_number++;
+        return 0;
+    }
 }
 
-static int yuv_save(AVPicture *picture, int width, int height, const char *filename)
+static int img_read_close(AVFormatContext *s1)
 {
-    ByteIOContext pb1, *pb = &pb1;
-    char fname[1024], *p;
-    int i, j;
-    UINT8 *ptr;
-    static char *ext = "YUV";
-
-    strcpy(fname, filename);
-    p = strrchr(fname, '.');
-    if (!p || p[1] != 'Y')
-        return -EIO;
-
-    for(i=0;i<3;i++) {
-        if (i == 1) {
-            width >>= 1;
-            height >>= 1;
-        }
-
-        p[1] = ext[i];
-        if (url_fopen(pb, fname, URL_WRONLY) < 0)
-            return -EIO;
-    
-        ptr = picture->data[i];
-        for(j=0;j<height;j++) {
-            put_buffer(pb, ptr, width);
-            ptr += picture->linesize[i];
-        }
-        put_flush_packet(pb);
-        url_fclose(pb);
-    }
     return 0;
 }
 
-static int yuv4mpeg_save(AVPicture *picture, int width, int height, ByteIOContext *pb, int need_stream_header, 
-                        int is_yuv, int raten, int rated, int aspectn, int aspectd) 
+/******************************************************/
+/* image output */
+
+static int img_set_parameters(AVFormatContext *s, AVFormatParameters *ap)
 {
-    int i, n, m;
-    char buf[Y4M_LINE_MAX+1], buf1[20];
-    UINT8 *ptr, *ptr1, *ptr2;
-    
-    /* construct stream header, if this is the first frame */
-    if(need_stream_header) {
-        n = snprintf(buf, sizeof(buf), "%s W%d H%d F%d:%d I%s A%d:%d\n",
-                Y4M_MAGIC,
-                width,
-                height,
-                raten, rated,
-                "p",			/* ffmpeg seems to only output progressive video */
-                aspectn, aspectd);
-        if (n < 0) {
-            fprintf(stderr, "Error. YUV4MPEG stream header write failed.\n");
-        } else {
-            fprintf(stderr, "YUV4MPEG stream header written. FPS is %d\n", raten);
-            put_buffer(pb, buf, strlen(buf));
-        }
-    }
-    
-    /* construct frame header */
-    m = snprintf(buf1, sizeof(buf1), "%s \n", Y4M_FRAME_MAGIC);
-    if (m < 0) {
-        fprintf(stderr, "Error. YUV4MPEG frame header write failed.\n");
+    VideoData *img = s->priv_data;
+    AVStream *st;
+    AVImageFormat *img_fmt;
+    int i;
+
+    /* find output image format */
+    if (ap && ap->image_format) {
+        img_fmt = ap->image_format;
     } else {
-        /* fprintf(stderr, "YUV4MPEG frame header written.\n"); */
-        put_buffer(pb, buf1, strlen(buf1));
-    }
-    
-    ptr = picture->data[0];
-    for(i=0;i<height;i++) {
-        put_buffer(pb, ptr, width);
-        ptr += picture->linesize[0];
+        img_fmt = guess_image_format(s->filename);
     }
+    if (!img_fmt)
+        return -1;
 
-    if (is_yuv) {
-        height >>= 1;
-        width >>= 1;
-        ptr1 = picture->data[1];
-        ptr2 = picture->data[2];
-        for(i=0;i<height;i++) {		/* Cb */
-            put_buffer(pb, ptr1, width);
-            ptr1 += picture->linesize[1];
-        }
-         for(i=0;i<height;i++) {	/* Cr */
-            put_buffer(pb, ptr2, width);
-            ptr2 += picture->linesize[2];
-         }
+    if (s->nb_streams != 1)
+        return -1;
+    
+    st = s->streams[0];
+    /* we select the first matching format */
+    for(i=0;i<PIX_FMT_NB;i++) {
+        if (img_fmt->supported_pixel_formats & (1 << i))
+            break;
     }
-    put_flush_packet(pb);
+    if (i >= PIX_FMT_NB)
+        return -1;
+    img->img_fmt = img_fmt;
+    img->pix_fmt = i;
+    st->codec.pix_fmt = img->pix_fmt;
     return 0;
 }
 
@@ -592,27 +257,7 @@ static int img_write_header(AVFormatContext *s)
     else
         img->is_pipe = 1;
         
-    if (s->oformat == &pgmyuvpipe_oformat ||
-        s->oformat == &pgmyuv_oformat) {
-        img->img_fmt = IMGFMT_PGMYUV;
-    } else if (s->oformat == &pgmpipe_oformat ||
-               s->oformat == &pgm_oformat) {
-        img->img_fmt = IMGFMT_PGM;
-    } else if (s->oformat == &imgyuv_oformat) {
-        img->img_fmt = IMGFMT_YUV;
-    } else if (s->oformat == &ppmpipe_oformat ||
-               s->oformat == &ppm_oformat) {
-        img->img_fmt = IMGFMT_PPM;
-    } else if (s->oformat == &yuv4mpegpipe_oformat) {
-        img->img_fmt = IMGFMT_YUV4MPEG;
-        img->header_written = 0;    
-    } else {
-        goto fail;
-    }
     return 0;
- fail:
-    av_free(img);
-    return -EIO;
 }
 
 static int img_write_packet(AVFormatContext *s, int stream_index,
@@ -621,123 +266,31 @@ static int img_write_packet(AVFormatContext *s, int stream_index,
     VideoData *img = s->priv_data;
     AVStream *st = s->streams[stream_index];
     ByteIOContext pb1, *pb;
-    AVPicture picture;
-    int width, height, need_stream_header, ret, size1, raten, rated, aspectn, aspectd, fps, fps1;
+    AVPicture *picture;
+    int width, height, ret;
     char filename[1024];
+    AVImageInfo info;
 
     width = st->codec.width;
     height = st->codec.height;
     
-    if (img->img_number == 1) {
-        need_stream_header = 1;
-    } else {
-        need_stream_header = 0;
-    }
-    
-    fps = st->codec.frame_rate;
-    fps1 = (((float)fps / FRAME_RATE_BASE) * 1000);
-   
-   /* Sorry about this messy code, but mpeg2enc is very picky about
-    * the framerates it accepts. */
-    switch(fps1) {
-    case 23976:
-        raten = 24000; /* turn the framerate into a ratio */
-        rated = 1001;
-        break;
-    case 29970:
-        raten = 30000;
-        rated = 1001;
-        break;
-    case 25000:
-        raten = 25;
-        rated = 1;
-        break;
-    case 30000:
-        raten = 30;
-        rated = 1;
-        break;
-    case 24000:
-        raten = 24;
-        rated = 1;
-        break;
-    case 50000:
-        raten = 50;
-        rated = 1;
-        break;
-    case 59940:
-        raten = 60000;
-        rated = 1001;
-        break;
-    case 60000:
-        raten = 60;
-        rated = 1;
-        break;
-    default:
-        raten = fps1; /* this setting should work, but often doesn't */
-        rated = 1000;
-        break;
-    }
-    
-    aspectn = 1;
-    aspectd = 1;	/* ffmpeg always uses a 1:1 aspect ratio */
+    picture = (AVPicture *)buf;
 
-    switch(st->codec.pix_fmt) {
-    case PIX_FMT_YUV420P:
-        size1 = (width * height * 3) / 2;
-        if (size != size1)
-            return -EIO;
-        
-        picture.data[0] = buf;
-        picture.data[1] = picture.data[0] + width * height;
-        picture.data[2] = picture.data[1] + (width * height) / 4;
-        picture.linesize[0] = width;
-        picture.linesize[1] = width >> 1; 
-        picture.linesize[2] = width >> 1;
-        break;
-    case PIX_FMT_RGB24:
-        size1 = (width * height * 3);
-        if (size != size1)
-            return -EIO;
-        picture.data[0] = buf;
-        picture.linesize[0] = width * 3;
-        break;
-    default:
-        return -EIO;
-    }
-    
-/*
-    This if-statement destroys pipes - I do not see why it is necessary
-    if (get_frame_filename(filename, sizeof(filename), 
-                           img->path, img->img_number) < 0)
-        return -EIO;
-*/
-    get_frame_filename(filename, sizeof(filename), 
-                       img->path, img->img_number);
     if (!img->is_pipe) {
+        if (get_frame_filename(filename, sizeof(filename), 
+                               img->path, img->img_number) < 0)
+            return -EIO;
         pb = &pb1;
         if (url_fopen(pb, filename, URL_WRONLY) < 0)
             return -EIO;
     } else {
         pb = &s->pb;
     }
-    switch(img->img_fmt) {
-    case IMGFMT_PGMYUV:
-        ret = pgm_save(&picture, width, height, pb, 1);
-        break;
-    case IMGFMT_PGM:
-        ret = pgm_save(&picture, width, height, pb, 0);
-        break;
-    case IMGFMT_YUV:
-        ret = yuv_save(&picture, width, height, filename);
-        break;
-    case IMGFMT_PPM:
-        ret = ppm_save(&picture, width, height, pb);
-        break;
-    case IMGFMT_YUV4MPEG:
-         ret = yuv4mpeg_save(&picture, width, height, pb,
-         need_stream_header, 1, raten, rated, aspectn, aspectd);
-        break;
-    }
+    info.width = width;
+    info.height = height;
+    info.pix_fmt = st->codec.pix_fmt;
+    info.pict = *picture;
+    ret = av_write_image(pb, img->img_fmt, &info);
     if (!img->is_pipe) {
         url_fclose(pb);
     }
@@ -751,38 +304,13 @@ static int img_write_trailer(AVFormatContext *s)
     return 0;
 }
 
-static AVInputFormat pgm_iformat = {
-    "pgm",
-    "pgm image format",
-    sizeof(VideoData),
-    NULL,
-    img_read_header,
-    img_read_packet,
-    img_read_close,
-    NULL,
-    AVFMT_NOFILE | AVFMT_NEEDNUMBER,
-    .extensions = "pgm",
-};
-
-static AVOutputFormat pgm_oformat = {
-    "pgm",
-    "pgm image format",
-    "",
-    "pgm",
-    sizeof(VideoData),
-    CODEC_ID_NONE,
-    CODEC_ID_RAWVIDEO,
-    img_write_header,
-    img_write_packet,
-    img_write_trailer,
-    AVFMT_NOFILE | AVFMT_NEEDNUMBER,
-};
+/* input */
 
-static AVInputFormat pgmyuv_iformat = {
-    "pgmyuv",
-    "pgm with YUV content image format",
+static AVInputFormat image_iformat = {
+    "image",
+    "image sequence",
     sizeof(VideoData),
-    NULL, /* no probe */
+    image_probe,
     img_read_header,
     img_read_packet,
     img_read_close,
@@ -790,77 +318,9 @@ static AVInputFormat pgmyuv_iformat = {
     AVFMT_NOFILE | AVFMT_NEEDNUMBER,
 };
 
-static AVOutputFormat pgmyuv_oformat = {
-    "pgmyuv",
-    "pgm with YUV content image format",
-    "",
-    "pgm",
-    sizeof(VideoData),
-    CODEC_ID_NONE,
-    CODEC_ID_RAWVIDEO,
-    img_write_header,
-    img_write_packet,
-    img_write_trailer,
-    AVFMT_NOFILE | AVFMT_NEEDNUMBER,
-};
-
-static AVInputFormat ppm_iformat = {
-    "ppm",
-    "ppm image format",
-    sizeof(VideoData),
-    NULL,
-    img_read_header,
-    img_read_packet,
-    img_read_close,
-    NULL,
-    AVFMT_NOFILE | AVFMT_NEEDNUMBER | AVFMT_RGB24,
-    .extensions = "ppm",
-};
-
-static AVOutputFormat ppm_oformat = {
-    "ppm",
-    "ppm image format",
-    "",
-    "ppm",
-    sizeof(VideoData),
-    CODEC_ID_NONE,
-    CODEC_ID_RAWVIDEO,
-    img_write_header,
-    img_write_packet,
-    img_write_trailer,
-    AVFMT_NOFILE | AVFMT_NEEDNUMBER | AVFMT_RGB24,
-};
-
-static AVInputFormat imgyuv_iformat = {
-    ".Y.U.V",
-    ".Y.U.V format",
-    sizeof(VideoData),
-    NULL,
-    img_read_header,
-    img_read_packet,
-    img_read_close,
-    NULL,
-    AVFMT_NOFILE | AVFMT_NEEDNUMBER,
-    .extensions = "Y",
-};
-
-static AVOutputFormat imgyuv_oformat = {
-    ".Y.U.V",
-    ".Y.U.V format",
-    "",
-    "Y",
-    sizeof(VideoData),
-    CODEC_ID_NONE,
-    CODEC_ID_RAWVIDEO,
-    img_write_header,
-    img_write_packet,
-    img_write_trailer,
-    AVFMT_NOFILE | AVFMT_NEEDNUMBER,
-};
-
-static AVInputFormat pgmpipe_iformat = {
-    "pgmpipe",
-    "PGM pipe format",
+static AVInputFormat imagepipe_iformat = {
+    "imagepipe",
+    "piped image sequence",
     sizeof(VideoData),
     NULL, /* no probe */
     img_read_header,
@@ -869,108 +329,46 @@ static AVInputFormat pgmpipe_iformat = {
     NULL,
 };
 
-static AVOutputFormat pgmpipe_oformat = {
-    "pgmpipe",
-    "PGM pipe format",
-    "",
-    "pgm",
-    sizeof(VideoData),
-    CODEC_ID_NONE,
-    CODEC_ID_RAWVIDEO,
-    img_write_header,
-    img_write_packet,
-    img_write_trailer,
-};
 
-static AVInputFormat pgmyuvpipe_iformat = {
-    "pgmyuvpipe",
-    "PGM YUV pipe format",
-    sizeof(VideoData),
-    NULL, /* no probe */
-    img_read_header,
-    img_read_packet,
-    img_read_close,
-    NULL,
-};
+/* output */
 
-static AVOutputFormat pgmyuvpipe_oformat = {
-    "pgmyuvpipe",
-    "PGM YUV pipe format",
+static AVOutputFormat image_oformat = {
+    "image",
+    "image sequence",
     "",
-    "pgm",
-    sizeof(VideoData),
-    CODEC_ID_NONE,
-    CODEC_ID_RAWVIDEO,
-    img_write_header,
-    img_write_packet,
-    img_write_trailer,
-};
-
-static AVInputFormat ppmpipe_iformat = {
-    "ppmpipe",
-    "PPM pipe format",
-    sizeof(VideoData),
-    NULL, /* no probe */
-    img_read_header,
-    img_read_packet,
-    img_read_close,
-    NULL,
-    .flags = AVFMT_RGB24,
-};
-
-static AVOutputFormat ppmpipe_oformat = {
-    "ppmpipe",
-    "PPM pipe format",
     "",
-    "ppm",
     sizeof(VideoData),
     CODEC_ID_NONE,
     CODEC_ID_RAWVIDEO,
     img_write_header,
     img_write_packet,
     img_write_trailer,
-    .flags = AVFMT_RGB24,
+    AVFMT_NOFILE | AVFMT_NEEDNUMBER | AVFMT_RAWPICTURE,
+    img_set_parameters,
 };
 
-
-static AVOutputFormat yuv4mpegpipe_oformat = {
-    "yuv4mpegpipe",
-    "YUV4MPEG pipe format",
+static AVOutputFormat imagepipe_oformat = {
+    "imagepipe",
+    "piped image sequence",
+    "",
     "",
-    "yuv4mpeg",
     sizeof(VideoData),
     CODEC_ID_NONE,
     CODEC_ID_RAWVIDEO,
     img_write_header,
     img_write_packet,
     img_write_trailer,
+    AVFMT_NEEDNUMBER | AVFMT_RAWPICTURE,
+    img_set_parameters,
 };
 
-
 int img_init(void)
 {
-    av_register_input_format(&pgm_iformat);
-    av_register_output_format(&pgm_oformat);
-
-    av_register_input_format(&pgmyuv_iformat);
-    av_register_output_format(&pgmyuv_oformat);
-
-    av_register_input_format(&ppm_iformat);
-    av_register_output_format(&ppm_oformat);
-
-    av_register_input_format(&imgyuv_iformat);
-    av_register_output_format(&imgyuv_oformat);
-    
-    av_register_input_format(&pgmpipe_iformat);
-    av_register_output_format(&pgmpipe_oformat);
-
-    av_register_input_format(&pgmyuvpipe_iformat);
-    av_register_output_format(&pgmyuvpipe_oformat);
+    av_register_input_format(&image_iformat);
+    av_register_output_format(&image_oformat);
 
-    av_register_input_format(&ppmpipe_iformat);
-    av_register_output_format(&ppmpipe_oformat);
-       
-    av_register_output_format(&yuv4mpegpipe_oformat);
+    av_register_input_format(&imagepipe_iformat);
+    av_register_output_format(&imagepipe_oformat);
     
     return 0;
 }
diff --git a/libavformat/pnm.c b/libavformat/pnm.c
new file mode 100644
index 0000000..a0414c8
--- /dev/null
+++ b/libavformat/pnm.c
@@ -0,0 +1,285 @@
+/*
+ * PNM image format
+ * Copyright (c) 2002, 2003 Fabrice Bellard.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#include "avformat.h"
+
+static inline int pnm_space(int c)  
+{
+    return (c == ' ' || c == '\n' || c == '\r' || c == '\t');
+}
+
+static void pnm_get(ByteIOContext *f, char *str, int buf_size) 
+{
+    char *s;
+    int c;
+    
+    /* skip spaces and comments */
+    for(;;) {
+        c = url_fgetc(f);
+        if (c == '#')  {
+            do  {
+                c = url_fgetc(f);
+            } while (c != '\n' && c != URL_EOF);
+        } else if (!pnm_space(c)) {
+            break;
+        }
+    }
+    
+    s = str;
+    while (c != URL_EOF && !pnm_space(c)) {
+        if ((s - str)  < buf_size - 1)
+            *s++ = c;
+        c = url_fgetc(f);
+    }
+    *s = '\0';
+}
+
+static int pnm_read1(ByteIOContext *f, 
+                     int (*alloc_cb)(void *opaque, AVImageInfo *info), void *opaque,
+                     int allow_yuv)
+{
+    int i, n, linesize, h;
+    char buf1[32];
+    unsigned char *ptr;
+    AVImageInfo info1, *info = &info1;
+    int ret;
+
+    pnm_get(f, buf1, sizeof(buf1));
+    if (!strcmp(buf1, "P4")) {
+        info->pix_fmt = PIX_FMT_MONOWHITE;
+    } else if (!strcmp(buf1, "P5")) {
+        if (allow_yuv) 
+            info->pix_fmt = PIX_FMT_YUV420P;
+        else
+            info->pix_fmt = PIX_FMT_GRAY8;
+    } else if (!strcmp(buf1, "P6")) {
+        info->pix_fmt = PIX_FMT_RGB24;
+    } else {
+        return AVERROR_INVALIDDATA;
+    }
+    pnm_get(f, buf1, sizeof(buf1));
+    info->width = atoi(buf1);
+    if (info->width <= 0)
+        return AVERROR_INVALIDDATA;
+    pnm_get(f, buf1, sizeof(buf1));
+    info->height = atoi(buf1);
+    if (info->height <= 0)
+        return AVERROR_INVALIDDATA;
+    if (info->pix_fmt != PIX_FMT_MONOWHITE) {
+        pnm_get(f, buf1, sizeof(buf1));
+    }
+
+    /* more check if YUV420 */
+    if (info->pix_fmt == PIX_FMT_YUV420P) {
+        if ((info->width & 1) != 0)
+            return AVERROR_INVALIDDATA;
+        h = (info->height * 2);
+        if ((h % 3) != 0)
+            return AVERROR_INVALIDDATA;
+        h /= 3;
+        info->height = h;
+    }
+    
+    ret = alloc_cb(opaque, info);
+    if (ret)
+        return ret;
+    
+    switch(info->pix_fmt) {
+    default:
+        return AVERROR_INVALIDDATA;
+    case PIX_FMT_RGB24:
+        n = info->width * 3;
+        goto do_read;
+    case PIX_FMT_GRAY8:
+        n = info->width;
+        goto do_read;
+    case PIX_FMT_MONOWHITE:
+        n = (info->width + 7) >> 3;
+    do_read:
+        ptr = info->pict.data[0];
+        linesize = info->pict.linesize[0];
+        for(i = 0; i < info->height; i++) {
+            get_buffer(f, ptr, n);
+            ptr += linesize;
+        }
+        break;
+    case PIX_FMT_YUV420P:
+        {
+            unsigned char *ptr1, *ptr2;
+
+            n = info->width;
+            ptr = info->pict.data[0];
+            linesize = info->pict.linesize[0];
+            for(i = 0; i < info->height; i++) {
+                get_buffer(f, ptr, n);
+                ptr += linesize;
+            }
+            ptr1 = info->pict.data[1];
+            ptr2 = info->pict.data[2];
+            n >>= 1;
+            h = info->height >> 1;
+            for(i = 0; i < h; i++) {
+                get_buffer(f, ptr1, n);
+                get_buffer(f, ptr2, n);
+                ptr1 += info->pict.linesize[1];
+                ptr2 += info->pict.linesize[2];
+            }
+        }
+        break;
+    }
+    return 0;
+}
+
+static int pnm_read(ByteIOContext *f, 
+                    int (*alloc_cb)(void *opaque, AVImageInfo *info), void *opaque)
+{
+    return pnm_read1(f, alloc_cb, opaque, 0);
+}
+
+static int pgmyuv_read(ByteIOContext *f, 
+                       int (*alloc_cb)(void *opaque, AVImageInfo *info), void *opaque)
+{
+    return pnm_read1(f, alloc_cb, opaque, 1);
+}
+
+static int pnm_write(ByteIOContext *pb, AVImageInfo *info)
+{
+    int i, h, h1, c, n, linesize;
+    char buf[100];
+    UINT8 *ptr, *ptr1, *ptr2;
+
+    h = info->height;
+    h1 = h;
+    switch(info->pix_fmt) {
+    case PIX_FMT_MONOWHITE:
+        c = '4';
+        n = (info->width + 7) >> 3;
+        break;
+    case PIX_FMT_GRAY8:
+        c = '5';
+        n = info->width;
+        break;
+    case PIX_FMT_RGB24:
+        c = '6';
+        n = info->width * 3;
+        break;
+    case PIX_FMT_YUV420P:
+        c = '5';
+        n = info->width;
+        h1 = (h * 3) / 2;
+        break;
+    default:
+        return AVERROR_INVALIDDATA;
+    }
+    snprintf(buf, sizeof(buf), 
+             "P%c\n%d %d\n",
+             c, info->width, h1);
+    put_buffer(pb, buf, strlen(buf));
+    if (info->pix_fmt != PIX_FMT_MONOWHITE) {
+        snprintf(buf, sizeof(buf), 
+                 "%d\n", 255);
+        put_buffer(pb, buf, strlen(buf));
+    }
+    
+    ptr = info->pict.data[0];
+    linesize = info->pict.linesize[0];
+    for(i=0;i<h;i++) {
+        put_buffer(pb, ptr, n);
+        ptr += linesize;
+    }
+
+    if (info->pix_fmt == PIX_FMT_YUV420P) {
+        h >>= 1;
+        n >>= 1;
+        ptr1 = info->pict.data[1];
+        ptr2 = info->pict.data[2];
+        for(i=0;i<h;i++) {
+            put_buffer(pb, ptr1, n);
+            put_buffer(pb, ptr2, n);
+            ptr1 += info->pict.linesize[1];
+            ptr2 += info->pict.linesize[2];
+        }
+    }
+    put_flush_packet(pb);
+    return 0;
+}
+    
+static int pnm_probe(AVProbeData *pd)
+{
+    const char *p = pd->buf;
+    if (pd->buf_size >= 8 &&
+        p[0] == 'P' &&
+        p[1] >= '4' && p[1] <= '6' &&
+        p[2] == '\n')
+        return AVPROBE_SCORE_MAX;
+    else
+        return 0;
+}
+
+static int pgmyuv_probe(AVProbeData *pd)
+{
+    if (match_ext(pd->filename, "pgmyuv"))
+        return AVPROBE_SCORE_MAX;
+    else
+        return 0;
+}
+
+AVImageFormat pnm_image_format = {
+    "pnm",
+    NULL,
+    pnm_probe,
+    pnm_read,
+    0,
+    NULL,
+};
+
+AVImageFormat pbm_image_format = {
+    "pbm",
+    "pbm",
+    NULL,
+    NULL,
+    (1 << PIX_FMT_MONOWHITE),
+    pnm_write,
+};
+
+AVImageFormat pgm_image_format = {
+    "pgm",
+    "pgm",
+    NULL,
+    NULL,
+    (1 << PIX_FMT_GRAY8),
+    pnm_write,
+};
+
+AVImageFormat ppm_image_format = {
+    "ppm",
+    "ppm",
+    NULL,
+    NULL,
+    (1 << PIX_FMT_RGB24),
+    pnm_write,
+};
+
+AVImageFormat pgmyuv_image_format = {
+    "pgmyuv",
+    NULL,
+    pgmyuv_probe,
+    pgmyuv_read,
+    (1 << PIX_FMT_YUV420P),
+    pnm_write,
+};
diff --git a/libavformat/utils.c b/libavformat/utils.c
index e515949..2defc31 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -35,6 +35,7 @@
 
 AVInputFormat *first_iformat;
 AVOutputFormat *first_oformat;
+AVImageFormat *first_image_format;
 
 void av_register_input_format(AVInputFormat *format)
 {
@@ -84,6 +85,11 @@ AVOutputFormat *guess_format(const char *short_name, const char *filename,
     AVOutputFormat *fmt, *fmt_found;
     int score_max, score;
 
+    /* specific test for image sequences */
+    if (!short_name && filename && filename_number_test(filename) >= 0) {
+        return guess_format("image", NULL, NULL);
+    }
+
     /* find the proper file type */
     fmt_found = NULL;
     score_max = 0;
@@ -326,8 +332,8 @@ int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
         fmt = av_probe_input_format(pd, 0);
     }
 
-    /* if no file needed do not try to open one */
     if (!fmt || !(fmt->flags & AVFMT_NOFILE)) {
+        /* if no file needed do not try to open one */
         if (url_fopen(&ic->pb, filename, URL_RDONLY) < 0) {
             err = AVERROR_IO;
             goto fail;
@@ -365,6 +371,14 @@ int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
 
     ic->iformat = fmt;
 
+    /* check filename in case of an image number is expected */
+    if (ic->iformat->flags & AVFMT_NEEDNUMBER) {
+        if (filename_number_test(ic->filename) < 0) { 
+            err = AVERROR_NUMEXPECTED;
+            goto fail1;
+        }
+    }
+    
     /* allocate private data */
     ic->priv_data = av_mallocz(fmt->priv_data_size);
     if (!ic->priv_data) {
@@ -375,14 +389,6 @@ int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
     /* default pts settings is MPEG like */
     av_set_pts_info(ic, 33, 1, 90000);
 
-    /* check filename in case of an image number is expected */
-    if (ic->iformat->flags & AVFMT_NEEDNUMBER) {
-        if (filename_number_test(ic->filename) < 0) { 
-            err = AVERROR_NUMEXPECTED;
-            goto fail1;
-        }
-    }
-    
     err = ic->iformat->read_header(ic, ap);
     if (err < 0)
         goto fail1;
@@ -707,6 +713,21 @@ AVStream *av_new_stream(AVFormatContext *s, int id)
 /************************************************************/
 /* output media file */
 
+int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap)
+{
+    int ret;
+
+    s->priv_data = av_mallocz(s->oformat->priv_data_size);
+    if (!s->priv_data)
+        return AVERROR_NOMEM;
+    if (s->oformat->set_parameters) {
+        ret = s->oformat->set_parameters(s, ap);
+        if (ret < 0)
+            return ret;
+    }
+    return 0;
+}
+
 /**
  * allocate the stream private data and write the stream header to an
  * output media file
@@ -719,9 +740,6 @@ int av_write_header(AVFormatContext *s)
     int ret, i;
     AVStream *st;
 
-    s->priv_data = av_mallocz(s->oformat->priv_data_size);
-    if (!s->priv_data)
-        return AVERROR_NOMEM;
     /* default pts settings is MPEG like */
     av_set_pts_info(s, 33, 1, 90000);
     ret = s->oformat->write_header(s);
@@ -1291,3 +1309,88 @@ void av_frac_add(AVFrac *f, INT64 incr)
     }
     f->num = num;
 }
+
+/**
+ * register a new image format
+ * @param img_fmt Image format descriptor
+ */
+void av_register_image_format(AVImageFormat *img_fmt)
+{
+    AVImageFormat **p;
+
+    p = &first_image_format;
+    while (*p != NULL) p = &(*p)->next;
+    *p = img_fmt;
+    img_fmt->next = NULL;
+}
+
+/* guess image format */
+AVImageFormat *av_probe_image_format(AVProbeData *pd)
+{
+    AVImageFormat *fmt1, *fmt;
+    int score, score_max;
+
+    fmt = NULL;
+    score_max = 0;
+    for(fmt1 = first_image_format; fmt1 != NULL; fmt1 = fmt1->next) {
+        if (fmt1->img_probe) {
+            score = fmt1->img_probe(pd);
+            if (score > score_max) {
+                score_max = score;
+                fmt = fmt1;
+            }
+        }
+    }
+    return fmt;
+}
+
+AVImageFormat *guess_image_format(const char *filename)
+{
+    AVImageFormat *fmt1;
+
+    for(fmt1 = first_image_format; fmt1 != NULL; fmt1 = fmt1->next) {
+        if (fmt1->extensions && match_ext(filename, fmt1->extensions))
+            return fmt1;
+    }
+    return NULL;
+}
+
+/**
+ * Read an image from a stream. 
+ * @param gb byte stream containing the image
+ * @param fmt image format, NULL if probing is required
+ */
+int av_read_image(ByteIOContext *pb, const char *filename,
+                  AVImageFormat *fmt,
+                  int (*alloc_cb)(void *, AVImageInfo *info), void *opaque)
+{
+    char buf[PROBE_BUF_SIZE];
+    AVProbeData probe_data, *pd = &probe_data;
+    offset_t pos;
+    int ret;
+
+    if (!fmt) {
+        pd->filename = (char *)filename;
+        pd->buf = buf;
+        pos = url_ftell(pb);
+        pd->buf_size = get_buffer(pb, buf, PROBE_BUF_SIZE);
+        url_fseek(pb, pos, SEEK_SET);
+        fmt = av_probe_image_format(pd);
+    }
+    if (!fmt)
+        return AVERROR_NOFMT;
+    ret = fmt->img_read(pb, alloc_cb, opaque);
+    return ret;
+}
+
+/**
+ * Write an image to a stream.
+ * @param pb byte stream for the image output
+ * @param fmt image format
+ * @param img image data and informations
+ */
+int av_write_image(ByteIOContext *pb, AVImageFormat *fmt, AVImageInfo *img)
+{
+    return fmt->img_write(pb, img);
+}
+
diff --git a/libavformat/yuv.c b/libavformat/yuv.c
new file mode 100644
index 0000000..5d09585
--- /dev/null
+++ b/libavformat/yuv.c
@@ -0,0 +1,158 @@
+/*
+ * .Y.U.V image format
+ * Copyright (c) 2003 Fabrice Bellard.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#include "avformat.h"
+
+static int sizes[][2] = {
+    { 640, 480 },
+    { 720, 480 },
+    { 720, 576 },
+    { 352, 288 },
+    { 352, 240 },
+    { 160, 128 },
+    { 512, 384 },
+    { 640, 352 },
+    { 640, 240 },
+};
+
+static int infer_size(int *width_ptr, int *height_ptr, int size)
+{
+    int i;
+
+    for(i=0;i<sizeof(sizes)/sizeof(sizes[0]);i++) {
+        if ((sizes[i][0] * sizes[i][1]) == size) {
+            *width_ptr = sizes[i][0];
+            *height_ptr = sizes[i][1];
+            return 0;
+        }
+    }
+    return -1;
+}
+
+static int yuv_read(ByteIOContext *f,
+                    int (*alloc_cb)(void *opaque, AVImageInfo *info), void *opaque)
+{
+    ByteIOContext pb1, *pb = &pb1;
+    int img_size, ret;
+    char fname[1024], *p;
+    int size;
+    URLContext *h;
+    AVImageInfo info1, *info = &info1;
+    
+    /* XXX: hack hack */
+    h = url_fileno(f);
+    img_size = url_seek(h, 0, SEEK_END);
+    url_get_filename(h, fname, sizeof(fname));
+
+    if (infer_size(&info->width, &info->height, img_size) < 0) {
+        return -EIO;
+    }
+    info->pix_fmt = PIX_FMT_YUV420P;
+    
+    ret = alloc_cb(opaque, info);
+    if (ret)
+        return ret;
+    
+    size = info->width * info->height;
+    
+    p = strrchr(fname, '.');
+    if (!p || p[1] != 'Y')
+        return -EIO;
+
+    get_buffer(f, info->pict.data[0], size);
+    
+    p[1] = 'U';
+    if (url_fopen(pb, fname, URL_RDONLY) < 0)
+        return -EIO;
+
+    get_buffer(pb, info->pict.data[1], size / 4);
+    url_fclose(pb);
+    
+    p[1] = 'V';
+    if (url_fopen(pb, fname, URL_RDONLY) < 0)
+        return -EIO;
+
+    get_buffer(pb, info->pict.data[2], size / 4);
+    url_fclose(pb);
+    return 0;
+}
+
+static int yuv_write(ByteIOContext *pb2, AVImageInfo *info)
+{
+    ByteIOContext pb1, *pb;
+    char fname[1024], *p;
+    int i, j, width, height;
+    UINT8 *ptr;
+    URLContext *h;
+    static const char *ext = "YUV";
+    
+    /* XXX: hack hack */
+    h = url_fileno(pb2);
+    url_get_filename(h, fname, sizeof(fname));
+
+    p = strrchr(fname, '.');
+    if (!p || p[1] != 'Y')
+        return -EIO;
+
+    width = info->width;
+    height = info->height;
+
+    for(i=0;i<3;i++) {
+        if (i == 1) {
+            width >>= 1;
+            height >>= 1;
+        }
+
+        if (i >= 1) {
+            pb = &pb1;
+            p[1] = ext[i];
+            if (url_fopen(pb, fname, URL_WRONLY) < 0)
+                return -EIO;
+        } else {
+            pb = pb2;
+        }
+    
+        ptr = info->pict.data[i];
+        for(j=0;j<height;j++) {
+            put_buffer(pb, ptr, width);
+            ptr += info->pict.linesize[i];
+        }
+        put_flush_packet(pb);
+        if (i >= 1) {
+            url_fclose(pb);
+        }
+    }
+    return 0;
+}
+    
+static int yuv_probe(AVProbeData *pd)
+{
+    if (match_ext(pd->filename, "Y"))
+        return AVPROBE_SCORE_MAX;
+    else
+        return 0;
+}
+
+AVImageFormat yuv_image_format = {
+    "yuv",
+    "Y",
+    yuv_probe,
+    yuv_read,
+    (1 << PIX_FMT_YUV420P),
+    yuv_write,
+};