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author | Mike Melanson <mike@multimedia.cx> | 2004-01-02 04:45:06 +0000 |
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committer | Mike Melanson <mike@multimedia.cx> | 2004-01-02 04:45:06 +0000 |
commit | fafa0b75eebff24a721e5d1ccd0b724556e4152a (patch) | |
tree | ee3d6b34b6b783d97b634fea0e3190b17f5c46b8 /libavcodec/vmdav.c | |
parent | 34e0a29d36f9ffccd28d249f5baff15b519ca189 (diff) | |
download | ffmpeg-streaming-fafa0b75eebff24a721e5d1ccd0b724556e4152a.zip ffmpeg-streaming-fafa0b75eebff24a721e5d1ccd0b724556e4152a.tar.gz |
first pass at Sierra VMD A/V decoders; video looks great, audio is not
yet complete
Originally committed as revision 2652 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/vmdav.c')
-rw-r--r-- | libavcodec/vmdav.c | 548 |
1 files changed, 548 insertions, 0 deletions
diff --git a/libavcodec/vmdav.c b/libavcodec/vmdav.c new file mode 100644 index 0000000..a5c7f45 --- /dev/null +++ b/libavcodec/vmdav.c @@ -0,0 +1,548 @@ +/* + * Sierra VMD Audio & Video Decoders + * Copyright (C) 2004 the ffmpeg project + * + * 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 + * + */ + +/** + * @file vmdvideo.c + * Sierra VMD audio & video decoders + * by Vladimir "VAG" Gneushev (vagsoft at mail.ru) + * + * The video decoder outputs PAL8 colorspace data. The decoder expects + * a 0x330-byte VMD file header to be transmitted via extradata during + * codec initialization. Each encoded frame that is sent to this decoder + * is expected to be prepended with the appropriate 16-byte frame + * information record from the VMD file. + * + * The audio decoder, like the video decoder, expects each encoded data + * chunk to be prepended with the approriate 16-byte frame information + * record from the VMD file. It does not require the 0x330-byte VMD file + * header, but it does need the audio setup parameters passed in through + * normal libavcodec API means. + */ + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#include "common.h" +#include "avcodec.h" +#include "dsputil.h" + +#define VMD_HEADER_SIZE 0x330 +#define PALETTE_COUNT 256 + +#define LE_16(x) ((((uint8_t*)(x))[1] << 8) | ((uint8_t*)(x))[0]) +#define LE_32(x) ((((uint8_t*)(x))[3] << 24) | \ + (((uint8_t*)(x))[2] << 16) | \ + (((uint8_t*)(x))[1] << 8) | \ + ((uint8_t*)(x))[0]) + +/* + * Video Decoder + */ + +typedef struct VmdVideoContext { + + AVCodecContext *avctx; + DSPContext dsp; + AVFrame frame; + AVFrame prev_frame; + + unsigned char *buf; + int size; + + unsigned char palette[PALETTE_COUNT * 4]; + unsigned char *unpack_buffer; + +} VmdVideoContext; + +#define QUEUE_SIZE 0x1000 +#define QUEUE_MASK 0x0FFF + +static void lz_unpack(unsigned char *src, unsigned char *dest) +{ + unsigned char *s; + unsigned char *d; + unsigned char queue[QUEUE_SIZE]; + unsigned int qpos; + unsigned int dataleft; + unsigned int chainofs; + unsigned int chainlen; + unsigned int speclen; + unsigned char tag; + unsigned int i, j; + + s = src; + d = dest; + dataleft = LE_32(s); + s += 4; + memset(queue, QUEUE_SIZE, 0x20); + if (LE_32(s) == 0x56781234) { + s += 4; + qpos = 0x111; + speclen = 0xF + 3; + } else { + qpos = 0xFEE; + speclen = 100; /* no speclen */ + } + + while (dataleft > 0) { + tag = *s++; + if ((tag == 0xFF) && (dataleft > 8)) { + for (i = 0; i < 8; i++) { + queue[qpos++] = *d++ = *s++; + qpos &= QUEUE_MASK; + } + dataleft -= 8; + } else { + for (i = 0; i < 8; i++) { + if (dataleft == 0) + break; + if (tag & 0x01) { + queue[qpos++] = *d++ = *s++; + qpos &= QUEUE_MASK; + dataleft--; + } else { + chainofs = *s++; + chainofs |= ((*s & 0xF0) << 4); + chainlen = (*s++ & 0x0F) + 3; + if (chainlen == speclen) + chainlen = *s++ + 0xF + 3; + for (j = 0; j < chainlen; j++) { + *d = queue[chainofs++ & QUEUE_MASK]; + queue[qpos++] = *d++; + qpos &= QUEUE_MASK; + } + dataleft -= chainlen; + } + tag >>= 1; + } + } + } +} + +static int rle_unpack(unsigned char *src, unsigned char *dest, int len) +{ + unsigned char *ps; + unsigned char *pd; + int i, l; + + ps = src; + pd = dest; + if (len & 1) + *pd++ = *ps++; + + len >>= 1; + i = 0; + do { + l = *ps++; + if (l & 0x80) { + l = (l & 0x7F) * 2; + memcpy(pd, ps, l); + ps += l; + pd += l; + } else { + for (i = 0; i < l; i++) { + *pd++ = ps[0]; + *pd++ = ps[1]; + } + ps += 2; + } + i += l; + } while (i < len); + + return (ps - src); +} + +static void vmd_decode(VmdVideoContext *s) +{ + int i; + unsigned int *palette32; + unsigned char r, g, b; + + /* point to the start of the encoded data */ + unsigned char *p = s->buf + 16; + + unsigned char *pb; + unsigned char meth; + unsigned char *dp; /* pointer to current frame */ + unsigned char *pp; /* pointer to previous frame */ + unsigned char len; + int ofs; + + int frame_x, frame_y; + int frame_width, frame_height; + + frame_x = LE_16(&s->buf[6]); + frame_y = LE_16(&s->buf[8]); + frame_width = LE_16(&s->buf[10]) - frame_x + 1; + frame_height = LE_16(&s->buf[12]) - frame_y + 1; + + /* if only a certain region will be updated, copy the entire previous + * frame before the decode */ + if (frame_x || frame_y || (frame_width != s->avctx->width) || + (frame_height != s->avctx->height)) { + + memcpy(s->frame.data[0], s->prev_frame.data[0], + s->avctx->height * s->frame.linesize[0]); + } + + /* check if there is a new palette */ + if (s->buf[15] & 0x02) { + p += 2; + palette32 = (unsigned int *)s->palette; + for (i = 0; i < PALETTE_COUNT; i++) { + r = *p++ * 4; + g = *p++ * 4; + b = *p++ * 4; + palette32[i] = (r << 16) | (g << 8) | (b); + } + s->size -= (256 * 3 + 2); + } + if (s->size >= 0) { + /* originally UnpackFrame in VAG's code */ + pb = p; + meth = *pb++; + if (meth & 0x80) { + lz_unpack(pb, s->unpack_buffer); + meth &= 0x7F; + pb = s->unpack_buffer; + } + + dp = &s->frame.data[0][frame_y * s->frame.linesize[0] + frame_x]; + pp = &s->prev_frame.data[0][frame_y * s->prev_frame.linesize[0] + frame_x]; + switch (meth) { + case 1: + for (i = 0; i < frame_height; i++) { + ofs = 0; + do { + len = *pb++; + if (len & 0x80) { + len = (len & 0x7F) + 1; + memcpy(&dp[ofs], pb, len); + pb += len; + ofs += len; + } else { + /* interframe pixel copy */ + memcpy(&dp[ofs], &pp[ofs], len + 1); + ofs += len + 1; + } + } while (ofs < frame_width); + if (ofs > frame_width) { + printf (" VMD video: offset > width (%d > %d)\n", + ofs, frame_width); + break; + } + dp += s->frame.linesize[0]; + pp += s->prev_frame.linesize[0]; + } + break; + + case 2: + for (i = 0; i < frame_height; i++) { + memcpy(dp, pb, frame_width); + pb += frame_width; + dp += s->frame.linesize[0]; + pp += s->prev_frame.linesize[0]; + } + break; + + case 3: + for (i = 0; i < frame_height; i++) { + ofs = 0; + do { + len = *pb++; + if (len & 0x80) { + len = (len & 0x7F) + 1; + if (*pb++ == 0xFF) + len = rle_unpack(pb, dp, len); + else + memcpy(&dp[ofs], pb, len); + pb += len; + ofs += len; + } else { + /* interframe pixel copy */ + memcpy(&dp[ofs], &pp[ofs], len + 1); + ofs += len + 1; + } + } while (ofs < frame_width); + if (ofs > frame_width) { + printf (" VMD video: offset > width (%d > %d)\n", + ofs, frame_width); + } + dp += s->frame.linesize[0]; + pp += s->prev_frame.linesize[0]; + } + break; + } + } +} + +static int vmdvideo_decode_init(AVCodecContext *avctx) +{ + VmdVideoContext *s = (VmdVideoContext *)avctx->priv_data; + int i; + unsigned int *palette32; + int palette_index = 0; + unsigned char r, g, b; + unsigned char *vmd_header; + unsigned char *raw_palette; + + s->avctx = avctx; + avctx->pix_fmt = PIX_FMT_PAL8; + avctx->has_b_frames = 0; + dsputil_init(&s->dsp, avctx); + + /* make sure the VMD header made it */ + if (s->avctx->extradata_size != VMD_HEADER_SIZE) { + printf(" VMD video: expected extradata size of %d\n", + VMD_HEADER_SIZE); + return -1; + } + vmd_header = (unsigned char *)avctx->extradata; + + s->unpack_buffer = av_malloc(LE_32(&vmd_header[800])); + if (!s->unpack_buffer) + return -1; + + /* load up the initial palette */ + raw_palette = &vmd_header[28]; + palette32 = (unsigned int *)s->palette; + for (i = 0; i < PALETTE_COUNT; i++) { + r = raw_palette[palette_index++] * 4; + g = raw_palette[palette_index++] * 4; + b = raw_palette[palette_index++] * 4; + palette32[i] = (r << 16) | (g << 8) | (b); + } + + s->frame.data[0] = s->prev_frame.data[0] = NULL; + + return 0; +} + +static int vmdvideo_decode_frame(AVCodecContext *avctx, + void *data, int *data_size, + uint8_t *buf, int buf_size) +{ + VmdVideoContext *s = (VmdVideoContext *)avctx->priv_data; + + s->buf = buf; + s->size = buf_size; + + s->frame.reference = 1; + if (avctx->get_buffer(avctx, &s->frame)) { + printf (" VMD Video: get_buffer() failed\n"); + return -1; + } + + vmd_decode(s); + + /* make the palette available on the way out */ + memcpy(s->frame.data[1], s->palette, PALETTE_COUNT * 4); + + if (s->prev_frame.data[0]) + avctx->release_buffer(avctx, &s->prev_frame); + + /* shuffle frames */ + s->prev_frame = s->frame; + + *data_size = sizeof(AVFrame); + *(AVFrame*)data = s->frame; + + /* report that the buffer was completely consumed */ + return buf_size; +} + +static int vmdvideo_decode_end(AVCodecContext *avctx) +{ + VmdVideoContext *s = (VmdVideoContext *)avctx->priv_data; + + if (s->prev_frame.data[0]) + avctx->release_buffer(avctx, &s->prev_frame); + av_free(s->unpack_buffer); + + return 0; +} + + +/* + * Audio Decoder + */ + +typedef struct VmdAudioContext { + int channels; + int bits; + int block_align; + unsigned char steps8[16]; + unsigned short steps16[16]; + unsigned short steps128[256]; + short predictors[2]; +} VmdAudioContext; + +static int vmdaudio_decode_init(AVCodecContext *avctx) +{ + VmdAudioContext *s = (VmdAudioContext *)avctx->priv_data; + int i; + + s->channels = avctx->channels; + s->bits = avctx->bits_per_sample; + s->block_align = avctx->block_align; + +printf (" %d channels, %d bits/sample, block align = %d\n", + s->channels, s->bits, s->block_align); + + /* set up the steps8 and steps16 tables */ + for (i = 0; i < 8; i++) { + if (i < 4) + s->steps8[i] = i; + else + s->steps8[i] = s->steps8[i - 1] + i - 1; + + if (i == 0) + s->steps16[i] = 0; + else if (i == 1) + s->steps16[i] = 4; + else if (i == 2) + s->steps16[i] = 16; + else + s->steps16[i] = 1 << (i + 4); + } + + /* set up the step128 table */ + s->steps128[0] = 0; + s->steps128[1] = 8; + for (i = 0x02; i <= 0x20; i++) + s->steps128[i] = (i - 1) << 4; + for (i = 0x21; i <= 0x60; i++) + s->steps128[i] = (i + 0x1F) << 3; + for (i = 0x61; i <= 0x70; i++) + s->steps128[i] = (i - 0x51) << 6; + for (i = 0x71; i <= 0x78; i++) + s->steps128[i] = (i - 0x69) << 8; + for (i = 0x79; i <= 0x7D; i++) + s->steps128[i] = (i - 0x75) << 10; + s->steps128[0x7E] = 0x3000; + s->steps128[0x7F] = 0x4000; + + /* set up the negative half of each table */ + for (i = 0; i < 8; i++) { + s->steps8[i + 8] = -s->steps8[i]; + s->steps16[i + 8] = -s->steps16[i]; + } + for (i = 0; i < 128; i++) + s->steps128[i + 128] = -s->steps128[i]; + + return 0; +} + +static void vmdaudio_decode_audio(VmdAudioContext *s, unsigned char *data, + uint8_t *buf, int ratio) { + +} + +static void vmdaudio_loadsound(VmdAudioContext *s, unsigned char *data, + uint8_t *buf, int silence) +{ + if (s->channels == 2) { + if ((s->block_align & 0x01) == 0) { + if (silence) + memset(data, 0, s->block_align * 2); + else + vmdaudio_decode_audio(s, data, buf, 1); + } else { + if (silence) + memset(data, 0, s->block_align * 2); +// else +// vmdaudio_decode_audio(s, data, buf, 1); + } + } else { + } +} + +static int vmdaudio_decode_frame(AVCodecContext *avctx, + void *data, int *data_size, + uint8_t *buf, int buf_size) +{ + VmdAudioContext *s = (VmdAudioContext *)avctx->priv_data; + unsigned int sound_flags; + unsigned char *output_samples = (unsigned char *)data; + + /* point to the start of the encoded data */ + unsigned char *p = buf + 16; + unsigned char *p_end = buf + buf_size; + + if (buf[6] == 1) { + /* the chunk contains audio */ + vmdaudio_loadsound(s, output_samples, p, 0); + } else if (buf[6] == 2) { + /* the chunk contains audio and silence mixed together */ + sound_flags = LE_32(p); + p += 4; + + /* do something with extrabufs here? */ + + while (p < p_end) { + if (sound_flags & 0x01) + /* audio */ + vmdaudio_loadsound(s, output_samples, p, 1); + else + /* silence */ + vmdaudio_loadsound(s, output_samples, p, 0); + p += s->block_align; + output_samples += (s->block_align * s->bits / 8); + sound_flags >>= 1; + } + } else if (buf[6] == 3) { + /* silent chunk */ + vmdaudio_loadsound(s, output_samples, p, 1); + } + + +// *datasize = ; + return buf_size; +} + + +/* + * Public Data Structures + */ + +AVCodec vmdvideo_decoder = { + "vmdvideo", + CODEC_TYPE_VIDEO, + CODEC_ID_VMDVIDEO, + sizeof(VmdVideoContext), + vmdvideo_decode_init, + NULL, + vmdvideo_decode_end, + vmdvideo_decode_frame, + CODEC_CAP_DR1, +}; + +AVCodec vmdaudio_decoder = { + "vmdaudio", + CODEC_TYPE_AUDIO, + CODEC_ID_VMDAUDIO, + sizeof(VmdAudioContext), + vmdaudio_decode_init, + NULL, + NULL, + vmdaudio_decode_frame, +}; |