diff options
Diffstat (limited to 'libavcodec')
| -rw-r--r-- | libavcodec/Makefile | 2 | ||||
| -rw-r--r-- | libavcodec/adpcm.c | 130 | ||||
| -rw-r--r-- | libavcodec/allcodecs.c | 4 | ||||
| -rw-r--r-- | libavcodec/avcodec.h | 9 | ||||
| -rw-r--r-- | libavcodec/dpcm.c | 57 | ||||
| -rw-r--r-- | libavcodec/xan.c | 605 |
6 files changed, 795 insertions, 12 deletions
diff --git a/libavcodec/Makefile b/libavcodec/Makefile index 33e8857..98f66ac 100644 --- a/libavcodec/Makefile +++ b/libavcodec/Makefile @@ -18,7 +18,7 @@ OBJS= common.o utils.o mem.o allcodecs.o \ ratecontrol.o adpcm.o eval.o dv.o error_resilience.o \ fft.o mdct.o mace.o huffyuv.o cyuv.o opts.o raw.o h264.o golomb.o \ vp3.o asv1.o 4xm.o cabac.o ffv1.o ra144.o ra288.o vcr1.o cljr.o \ - roqvideo.o dpcm.o interplayvideo.o + roqvideo.o dpcm.o interplayvideo.o xan.o ifeq ($(AMR_NB),yes) ifeq ($(AMR_NB_FIXED),yes) diff --git a/libavcodec/adpcm.c b/libavcodec/adpcm.c index 45c9dd1..a9b3195 100644 --- a/libavcodec/adpcm.c +++ b/libavcodec/adpcm.c @@ -1,6 +1,6 @@ /* * ADPCM codecs - * Copyright (c) 2001 Fabrice Bellard. + * Copyright (c) 2001-2003 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 @@ -22,11 +22,13 @@ * @file adpcm.c * ADPCM codecs. * First version by Francois Revol revol@free.fr + * Fringe ADPCM codecs (e.g., DK3 and DK4) + * by Mike Melanson (melanson@pcisys.net) * * Features and limitations: * * Reference documents: - * http://www.pcisys.net/~melanson/codecs/adpcm.txt + * http://www.pcisys.net/~melanson/codecs/simpleaudio.html * http://www.geocities.com/SiliconValley/8682/aud3.txt * http://openquicktime.sourceforge.net/plugins.htm * XAnim sources (xa_codec.c) http://www.rasnaimaging.com/people/lapus/download.html @@ -293,14 +295,10 @@ static inline short adpcm_ima_expand_nibble(ADPCMChannelStatus *c, char nibble) sign = nibble & 8; delta = nibble & 7; -#if 0 - diff = step >> 3; - if (delta & 4) diff += step; - if (delta & 2) diff += step >> 1; - if (delta & 1) diff += step >> 2; -#else - diff = ((2 * delta + 1) * step) >> 3; // no jumps -#endif + /* perform direct multiplication instead of series of jumps proposed by + * the reference ADPCM implementation since modern CPUs can do the mults + * quickly enough */ + diff = ((2 * delta + 1) * step) >> 3; predictor = c->predictor; if (sign) predictor -= diff; else predictor += diff; @@ -355,6 +353,21 @@ static inline short adpcm_ms_expand_nibble(ADPCMChannelStatus *c, char nibble) return (short)predictor; } +/* DK3 ADPCM support macro */ +#define DK3_GET_NEXT_NIBBLE() \ + if (decode_top_nibble_next) \ + { \ + nibble = (last_byte >> 4) & 0x0F; \ + decode_top_nibble_next = 0; \ + } \ + else \ + { \ + last_byte = *src++; \ + if (src >= buf + buf_size) break; \ + nibble = last_byte & 0x0F; \ + decode_top_nibble_next = 1; \ + } + static int adpcm_decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size) @@ -367,6 +380,12 @@ static int adpcm_decode_frame(AVCodecContext *avctx, uint8_t *src; int st; /* stereo */ + /* DK3 ADPCM accounting variables */ + unsigned char last_byte = 0; + unsigned char nibble; + int decode_top_nibble_next = 0; + int diff_channel; + samples = data; src = buf; @@ -551,6 +570,94 @@ static int adpcm_decode_frame(AVCodecContext *avctx, src ++; } break; + case CODEC_ID_ADPCM_IMA_DK4: + if (buf_size > BLKSIZE) { + if (avctx->block_align != 0) + buf_size = avctx->block_align; + else + buf_size = BLKSIZE; + } + c->status[0].predictor = (src[0] | (src[1] << 8)); + c->status[0].step_index = src[2]; + src += 4; + if(c->status[0].predictor & 0x8000) + c->status[0].predictor -= 0x10000; + *samples++ = c->status[0].predictor; + if (st) { + c->status[1].predictor = (src[0] | (src[1] << 8)); + c->status[1].step_index = src[2]; + src += 4; + if(c->status[1].predictor & 0x8000) + c->status[1].predictor -= 0x10000; + *samples++ = c->status[1].predictor; + } + while (src < buf + buf_size) { + + /* take care of the top nibble (always left or mono channel) */ + *samples++ = adpcm_ima_expand_nibble(&c->status[0], + (src[0] >> 4) & 0x0F); + + /* take care of the bottom nibble, which is right sample for + * stereo, or another mono sample */ + if (st) + *samples++ = adpcm_ima_expand_nibble(&c->status[1], + src[0] & 0x0F); + else + *samples++ = adpcm_ima_expand_nibble(&c->status[0], + src[0] & 0x0F); + + src++; + } + break; + case CODEC_ID_ADPCM_IMA_DK3: + if (buf_size > BLKSIZE) { + if (avctx->block_align != 0) + buf_size = avctx->block_align; + else + buf_size = BLKSIZE; + } + c->status[0].predictor = (src[10] | (src[11] << 8)); + c->status[1].predictor = (src[12] | (src[13] << 8)); + c->status[0].step_index = src[14]; + c->status[1].step_index = src[15]; + /* sign extend the predictors */ + if(c->status[0].predictor & 0x8000) + c->status[0].predictor -= 0x10000; + if(c->status[1].predictor & 0x8000) + c->status[1].predictor -= 0x10000; + src += 16; + diff_channel = c->status[1].predictor; + + /* the DK3_GET_NEXT_NIBBLE macro issues the break statement when + * the buffer is consumed */ + while (1) { + + /* for this algorithm, c->status[0] is the sum channel and + * c->status[1] is the diff channel */ + + /* process the first predictor of the sum channel */ + DK3_GET_NEXT_NIBBLE(); + adpcm_ima_expand_nibble(&c->status[0], nibble); + + /* process the diff channel predictor */ + DK3_GET_NEXT_NIBBLE(); + adpcm_ima_expand_nibble(&c->status[1], nibble); + + /* process the first pair of stereo PCM samples */ + diff_channel = (diff_channel + c->status[1].predictor) / 2; + *samples++ = c->status[0].predictor + c->status[1].predictor; + *samples++ = c->status[0].predictor - c->status[1].predictor; + + /* process the second predictor of the sum channel */ + DK3_GET_NEXT_NIBBLE(); + adpcm_ima_expand_nibble(&c->status[0], nibble); + + /* process the second pair of stereo PCM samples */ + diff_channel = (diff_channel + c->status[1].predictor) / 2; + *samples++ = c->status[0].predictor + c->status[1].predictor; + *samples++ = c->status[0].predictor - c->status[1].predictor; + } + break; default: *data_size = 0; return -1; @@ -583,8 +690,9 @@ AVCodec name ## _decoder = { \ ADPCM_CODEC(CODEC_ID_ADPCM_IMA_QT, adpcm_ima_qt); ADPCM_CODEC(CODEC_ID_ADPCM_IMA_WAV, adpcm_ima_wav); +ADPCM_CODEC(CODEC_ID_ADPCM_IMA_DK3, adpcm_ima_dk3); +ADPCM_CODEC(CODEC_ID_ADPCM_IMA_DK4, adpcm_ima_dk4); ADPCM_CODEC(CODEC_ID_ADPCM_MS, adpcm_ms); ADPCM_CODEC(CODEC_ID_ADPCM_4XM, adpcm_4xm); #undef ADPCM_CODEC - diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c index c687ecf..4e792ba 100644 --- a/libavcodec/allcodecs.c +++ b/libavcodec/allcodecs.c @@ -123,6 +123,7 @@ void avcodec_register_all(void) register_avcodec(&mdec_decoder); register_avcodec(&roq_decoder); register_avcodec(&interplay_video_decoder); + register_avcodec(&xan_wc3_decoder); #ifdef CONFIG_AC3 register_avcodec(&ac3_decoder); #endif @@ -130,6 +131,7 @@ void avcodec_register_all(void) register_avcodec(&ra_288_decoder); register_avcodec(&roq_dpcm_decoder); register_avcodec(&interplay_dpcm_decoder); + register_avcodec(&xan_dpcm_decoder); #endif /* CONFIG_DECODERS */ #ifdef AMR_NB @@ -154,6 +156,8 @@ PCM_CODEC(CODEC_ID_PCM_MULAW, pcm_mulaw); /* adpcm codecs */ PCM_CODEC(CODEC_ID_ADPCM_IMA_QT, adpcm_ima_qt); PCM_CODEC(CODEC_ID_ADPCM_IMA_WAV, adpcm_ima_wav); +PCM_CODEC(CODEC_ID_ADPCM_IMA_DK3, adpcm_ima_dk3); +PCM_CODEC(CODEC_ID_ADPCM_IMA_DK4, adpcm_ima_dk4); PCM_CODEC(CODEC_ID_ADPCM_MS, adpcm_ms); PCM_CODEC(CODEC_ID_ADPCM_4XM, adpcm_4xm); diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h index f877b36..78f60ab 100644 --- a/libavcodec/avcodec.h +++ b/libavcodec/avcodec.h @@ -68,6 +68,8 @@ enum CodecID { CODEC_ID_MDEC, CODEC_ID_ROQ, CODEC_ID_INTERPLAY_VIDEO, + CODEC_ID_XAN_WC3, + CODEC_ID_XAN_WC4, /* various pcm "codecs" */ CODEC_ID_PCM_S16LE, @@ -82,6 +84,8 @@ enum CodecID { /* various adpcm codecs */ CODEC_ID_ADPCM_IMA_QT, CODEC_ID_ADPCM_IMA_WAV, + CODEC_ID_ADPCM_IMA_DK3, + CODEC_ID_ADPCM_IMA_DK4, CODEC_ID_ADPCM_MS, CODEC_ID_ADPCM_4XM, @@ -94,6 +98,7 @@ enum CodecID { /* various DPCM codecs */ CODEC_ID_ROQ_DPCM, CODEC_ID_INTERPLAY_DPCM, + CODEC_ID_XAN_DPCM, }; #define CODEC_ID_MPEGVIDEO CODEC_ID_MPEG1VIDEO @@ -1356,10 +1361,12 @@ extern AVCodec fourxm_decoder; extern AVCodec mdec_decoder; extern AVCodec roq_decoder; extern AVCodec interplay_video_decoder; +extern AVCodec xan_wc3_decoder; extern AVCodec ra_144_decoder; extern AVCodec ra_288_decoder; extern AVCodec roq_dpcm_decoder; extern AVCodec interplay_dpcm_decoder; +extern AVCodec xan_dpcm_decoder; /* pcm codecs */ #define PCM_CODEC(id, name) \ @@ -1379,6 +1386,8 @@ PCM_CODEC(CODEC_ID_PCM_MULAW, pcm_mulaw); PCM_CODEC(CODEC_ID_ADPCM_IMA_QT, adpcm_ima_qt); PCM_CODEC(CODEC_ID_ADPCM_IMA_WAV, adpcm_ima_wav); +PCM_CODEC(CODEC_ID_ADPCM_IMA_DK3, adpcm_ima_dk3); +PCM_CODEC(CODEC_ID_ADPCM_IMA_DK4, adpcm_ima_dk4); PCM_CODEC(CODEC_ID_ADPCM_MS, adpcm_ms); PCM_CODEC(CODEC_ID_ADPCM_4XM, adpcm_4xm); diff --git a/libavcodec/dpcm.c b/libavcodec/dpcm.c index bd3ad7f..958e464 100644 --- a/libavcodec/dpcm.c +++ b/libavcodec/dpcm.c @@ -21,8 +21,17 @@ * @file: dpcm.c * Assorted DPCM (differential pulse code modulation) audio codecs * by Mike Melanson (melanson@pcisys.net) + * Xan DPCM decoder by Mario Brito (mbrito@student.dei.uc.pt) * for more information on the specific data formats, visit: * http://www.pcisys.net/~melanson/codecs/simpleaudio.html + * + * Note about using the Xan DPCM decoder: Xan DPCM is used in AVI files + * found in the Wing Commander IV computer game. These AVI files contain + * WAVEFORMAT headers which report the audio format as 0x01: raw PCM. + * Clearly incorrect. To detect Xan DPCM, you will probably have to + * special-case your AVI demuxer to use Xan DPCM if the file uses 'Xxan' + * (Xan video) for its video codec. Alternately, such AVI files also contain + * the fourcc 'Axan' in the 'auds' chunk of the AVI header. */ #include "avcodec.h" @@ -115,6 +124,9 @@ static int dpcm_decode_frame(AVCodecContext *avctx, int channel_number = 0; short *output_samples = data; int sequence_number; + int shift[2]; + unsigned char byte; + short diff; switch(avctx->codec->id) { @@ -171,6 +183,40 @@ static int dpcm_decode_frame(AVCodecContext *avctx, s->last_delta[i] = predictor[i]; break; + + case CODEC_ID_XAN_DPCM: + in = 0; + shift[0] = shift[1] = 4; + predictor[0] = LE_16(&buf[in]); + in += 2; + SE_16BIT(predictor[0]); + if (s->channels == 2) { + predictor[1] = LE_16(&buf[in]); + in += 2; + SE_16BIT(predictor[1]); + } + + while (in < buf_size) { + byte = buf[in++]; + diff = (byte & 0xFC) << 8; + if ((byte & 0x03) == 3) + shift[channel_number]++; + else + shift[channel_number] -= (2 * (byte & 3)); + /* saturate the shifter to a lower limit of 0 */ + if (shift[channel_number] < 0) + shift[channel_number] = 0; + + diff >>= shift[channel_number]; + predictor[channel_number] += diff; + + SATURATE_S16(predictor[channel_number]); + output_samples[out++] = predictor[channel_number]; + + /* toggle channel */ + channel_number ^= s->channels - 1; + } + break; } *data_size = out * sizeof(short); @@ -198,3 +244,14 @@ AVCodec interplay_dpcm_decoder = { NULL, dpcm_decode_frame, }; + +AVCodec xan_dpcm_decoder = { + "xan_dpcm", + CODEC_TYPE_AUDIO, + CODEC_ID_XAN_DPCM, + sizeof(DPCMContext), + dpcm_decode_init, + NULL, + NULL, + dpcm_decode_frame, +}; diff --git a/libavcodec/xan.c b/libavcodec/xan.c new file mode 100644 index 0000000..72d4e5f --- /dev/null +++ b/libavcodec/xan.c @@ -0,0 +1,605 @@ +/* + * Wing Commander/Xan Video Decoder + * Copyright (C) 2003 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 xan.c + * Xan video decoder for Wing Commander III & IV computer games + * by Mario Brito (mbrito@student.dei.uc.pt) + * and Mike Melanson (melanson@pcisys.net) + * For more information about the Xan format, visit: + * http://www.pcisys.net/~melanson/codecs/ + */ + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#include "common.h" +#include "avcodec.h" +#include "dsputil.h" + +#define PALETTE_COUNT 256 +#define PALETTE_CONTROL_SIZE ((256 * 3) + 1) + +typedef struct XanContext { + + AVCodecContext *avctx; + DSPContext dsp; + AVFrame last_frame; + AVFrame current_frame; + + unsigned char *buf; + int size; + + unsigned char palette[PALETTE_COUNT * 4]; + + /* scratch space */ + unsigned char *buffer1; + unsigned char *buffer2; + +} XanContext; + +#define BE_16(x) ((((uint8_t*)(x))[0] << 8) | ((uint8_t*)(x))[1]) +#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]) + +/* RGB -> YUV conversion stuff */ +#define SCALEFACTOR 65536 +#define CENTERSAMPLE 128 + +#define COMPUTE_Y(r, g, b) \ + (unsigned char) \ + ((y_r_table[r] + y_g_table[g] + y_b_table[b]) / SCALEFACTOR) +#define COMPUTE_U(r, g, b) \ + (unsigned char) \ + ((u_r_table[r] + u_g_table[g] + u_b_table[b]) / SCALEFACTOR + CENTERSAMPLE) +#define COMPUTE_V(r, g, b) \ + (unsigned char) \ + ((v_r_table[r] + v_g_table[g] + v_b_table[b]) / SCALEFACTOR + CENTERSAMPLE) + +#define Y_R (SCALEFACTOR * 0.29900) +#define Y_G (SCALEFACTOR * 0.58700) +#define Y_B (SCALEFACTOR * 0.11400) + +#define U_R (SCALEFACTOR * -0.16874) +#define U_G (SCALEFACTOR * -0.33126) +#define U_B (SCALEFACTOR * 0.50000) + +#define V_R (SCALEFACTOR * 0.50000) +#define V_G (SCALEFACTOR * -0.41869) +#define V_B (SCALEFACTOR * -0.08131) + +/* + * Precalculate all of the YUV tables since it requires fewer than + * 10 kilobytes to store them. + */ +static int y_r_table[256]; +static int y_g_table[256]; +static int y_b_table[256]; + +static int u_r_table[256]; +static int u_g_table[256]; +static int u_b_table[256]; + +static int v_r_table[256]; +static int v_g_table[256]; +static int v_b_table[256]; + +static int xan_decode_init(AVCodecContext *avctx) +{ + XanContext *s = avctx->priv_data; + int i; + + s->avctx = avctx; + + if ((avctx->codec->id == CODEC_ID_XAN_WC3) && + (s->avctx->extradata_size != PALETTE_CONTROL_SIZE)) { + printf (" WC3 Xan video: expected extradata_size of %d\n", + PALETTE_CONTROL_SIZE); + return -1; + } + + avctx->pix_fmt = PIX_FMT_YUV444P; + avctx->has_b_frames = 0; + dsputil_init(&s->dsp, avctx); + + /* initialize the RGB -> YUV tables */ + for (i = 0; i < 256; i++) { + y_r_table[i] = Y_R * i; + y_g_table[i] = Y_G * i; + y_b_table[i] = Y_B * i; + + u_r_table[i] = U_R * i; + u_g_table[i] = U_G * i; + u_b_table[i] = U_B * i; + + v_r_table[i] = V_R * i; + v_g_table[i] = V_G * i; + v_b_table[i] = V_B * i; + } + + s->buffer1 = av_malloc(avctx->width * avctx->height * 4); + s->buffer2 = av_malloc(avctx->width * avctx->height * 4); + if (!s->buffer1 || !s->buffer2) + return -1; + + return 0; +} + +/* This function is used in lieu of memcpy(). This decoder can not use + * memcpy because the memory locations often overlap and + * memcpy doesn't like that; it's not uncommon, for example, for + * dest = src+1, to turn byte A into pattern AAAAAAAA. + * This was originally repz movsb in Intel x86 ASM. */ +static inline void bytecopy(unsigned char *dest, unsigned char *src, int count) +{ + int i; + + for (i = 0; i < count; i++) + dest[i] = src[i]; +} + +static int xan_decode_method_1(unsigned char *dest, unsigned char *src) +{ + unsigned char byte = *src++; + unsigned char ival = byte + 0x16; + unsigned char * ptr = src + byte*2; + unsigned char val = ival; + int counter = 0; + + unsigned char bits = *ptr++; + + while ( val != 0x16 ) { + if ( (1 << counter) & bits ) + val = src[byte + val - 0x17]; + else + val = src[val - 0x17]; + + if ( val < 0x16 ) { + *dest++ = val; + val = ival; + } + + if (counter++ == 7) { + counter = 0; + bits = *ptr++; + } + } + + return 0; +} + +static int xan_decode_method_2(unsigned char *dest, unsigned char *src) +{ + unsigned char opcode; + int size; + int offset; + int byte1, byte2, byte3; + + for (;;) { + opcode = *src++; + + if ( (opcode & 0x80) == 0 ) { + + offset = *src++; + + size = opcode & 3; + bytecopy(dest, src, size); dest += size; src += size; + + size = ((opcode & 0x1c) >> 2) + 3; + bytecopy (dest, dest - (((opcode & 0x60) << 3) + offset + 1), size); + dest += size; + + } else if ( (opcode & 0x40) == 0 ) { + + byte1 = *src++; + byte2 = *src++; + + size = byte1 >> 6; + bytecopy (dest, src, size); dest += size; src += size; + + size = (opcode & 0x3f) + 4; + bytecopy (dest, dest - (((byte1 & 0x3f) << 8) + byte2 + 1), size); + dest += size; + + } else if ( (opcode & 0x20) == 0 ) { + + byte1 = *src++; + byte2 = *src++; + byte3 = *src++; + + size = opcode & 3; + bytecopy (dest, src, size); dest += size; src += size; + + size = byte3 + 5 + ((opcode & 0xc) << 6); + bytecopy (dest, + dest - ((((opcode & 0x10) >> 4) << 0x10) + 1 + (byte1 << 8) + byte2), + size); + dest += size; + } else { + size = ((opcode & 0x1f) << 2) + 4; + + if (size > 0x70) + break; + + bytecopy (dest, src, size); dest += size; src += size; + } + } + + size = opcode & 3; + bytecopy(dest, src, size); dest += size; src += size; + + return 0; +} + +static void inline xan_wc3_build_palette(XanContext *s, + unsigned char *palette_data) +{ + int i; + unsigned char r, g, b; + + /* transform the palette passed through the palette control structure + * into the necessary internal format depending on colorspace */ + + switch (s->avctx->pix_fmt) { + + case PIX_FMT_YUV444P: + for (i = 0; i < PALETTE_COUNT; i++) { + r = *palette_data++; + g = *palette_data++; + b = *palette_data++; + s->palette[i * 4 + 0] = COMPUTE_Y(r, g, b); + s->palette[i * 4 + 1] = COMPUTE_U(r, g, b); + s->palette[i * 4 + 2] = COMPUTE_V(r, g, b); + } + break; + + default: + printf (" Xan WC3: Unhandled colorspace\n"); + break; + } +} + +static void inline xan_wc3_output_pixel_run(XanContext *s, + unsigned char *pixel_buffer, int x, int y, int pixel_count) +{ + int stride; + int line_inc; + int index; + int current_x; + int width = s->avctx->width; + unsigned char pixel; + unsigned char *y_plane; + unsigned char *u_plane; + unsigned char *v_plane; + + switch (s->avctx->pix_fmt) { + + case PIX_FMT_YUV444P: + y_plane = s->current_frame.data[0]; + u_plane = s->current_frame.data[1]; + v_plane = s->current_frame.data[2]; + stride = s->current_frame.linesize[0]; + line_inc = stride - width; + index = y * stride + x; + current_x = x; + while(pixel_count--) { + pixel = *pixel_buffer++; + + y_plane[index] = s->palette[pixel * 4 + 0]; + u_plane[index] = s->palette[pixel * 4 + 1]; + v_plane[index] = s->palette[pixel * 4 + 2]; + + index++; + current_x++; + if (current_x >= width) { + /* reset accounting variables */ + index += line_inc; + current_x = 0; + } + } + break; + + default: + printf (" Xan WC3: Unhandled colorspace\n"); + break; + } +} + +static void inline xan_wc3_copy_pixel_run(XanContext *s, + int x, int y, int pixel_count, int motion_x, int motion_y) +{ + int stride; + int line_inc; + int curframe_index, prevframe_index; + int curframe_x, prevframe_x; + int width = s->avctx->width; + unsigned char *y_plane, *u_plane, *v_plane; + unsigned char *prev_y_plane, *prev_u_plane, *prev_v_plane; + + switch (s->avctx->pix_fmt) { + + case PIX_FMT_YUV444P: + y_plane = s->current_frame.data[0]; + u_plane = s->current_frame.data[1]; + v_plane = s->current_frame.data[2]; + prev_y_plane = s->last_frame.data[0]; + prev_u_plane = s->last_frame.data[1]; + prev_v_plane = s->last_frame.data[2]; + stride = s->current_frame.linesize[0]; + line_inc = stride - width; + curframe_index = y * stride + x; + curframe_x = x; + prevframe_index = (y + motion_x) * stride + x + motion_x; + prevframe_x = x + motion_x; + while(pixel_count--) { + + y_plane[curframe_index] = prev_y_plane[prevframe_index]; + u_plane[curframe_index] = prev_u_plane[prevframe_index]; + v_plane[curframe_index] = prev_v_plane[prevframe_index]; + + curframe_index++; + curframe_x++; + if (curframe_x >= width) { + /* reset accounting variables */ + curframe_index += line_inc; + curframe_x = 0; + } + + prevframe_index++; + prevframe_x++; + if (prevframe_x >= width) { + /* reset accounting variables */ + prevframe_index += line_inc; + prevframe_x = 0; + } + } + break; + + default: + printf (" Xan WC3: Unhandled colorspace\n"); + break; + } +} + +static void xan_wc3_decode_frame(XanContext *s) { + + int width = s->avctx->width; + int height = s->avctx->height; + int total_pixels = width * height; + unsigned char opcode; + unsigned char flag = 0; + int size = 0; + int motion_x, motion_y; + int x, y; + + unsigned char *method1_buffer = s->buffer1; + unsigned char *method2_buffer = s->buffer2; + + /* pointers to segments inside the compressed chunk */ + unsigned char *method1_segment; + unsigned char *size_segment; + unsigned char *vector_segment; + unsigned char *method2_segment; + + method1_segment = s->buf + LE_16(&s->buf[0]); + size_segment = s->buf + LE_16(&s->buf[2]); + vector_segment = s->buf + LE_16(&s->buf[4]); + method2_segment = s->buf + LE_16(&s->buf[6]); + + xan_decode_method_1(method1_buffer, method1_segment); + if (method2_segment[0] == 2) + xan_decode_method_2(method2_buffer, method2_segment + 1); + else + method2_buffer = method2_segment + 1; + + /* use the decoded data segments to build the frame */ + x = y = 0; + while (total_pixels) { + + opcode = *method1_buffer++; + size = 0; + + switch (opcode) { + + case 0: + flag ^= 1; + continue; + + case 1: + case 2: + case 3: + case 4: + case 5: + case 6: + case 7: + case 8: + size = opcode; + break; + + case 12: + case 13: + case 14: + case 15: + case 16: + case 17: + case 18: + size += (opcode - 10); + break; + + case 9: + case 19: + size = *size_segment++; + break; + + case 10: + case 20: + size = BE_16(&size_segment[0]); + size_segment += 2; + break; + + case 11: + case 21: + size = (size_segment[0] << 16) | (size_segment[1] << 8) | + size_segment[2]; + size_segment += 3; + break; + } + + if (opcode < 12) { + flag ^= 1; + if (flag) { + /* run of (size) pixels is unchanged from last frame */ + xan_wc3_copy_pixel_run(s, x, y, size, 0, 0); + } else { + /* output a run of pixels from method2_buffer */ + xan_wc3_output_pixel_run(s, method2_buffer, x, y, size); + method2_buffer += size; + } + } else { + /* run-based motion compensation from last frame */ + motion_x = (*vector_segment >> 4) & 0xF; + motion_y = *vector_segment & 0xF; + vector_segment++; + + /* sign extension */ + if (motion_x & 0x8) + motion_x |= 0xFFFFFFF0; + if (motion_y & 0x8) + motion_y |= 0xFFFFFFF0; + + /* copy a run of pixels from the previous frame */ + xan_wc3_copy_pixel_run(s, x, y, size, motion_x, motion_y); + + flag = 0; + } + + /* coordinate accounting */ + total_pixels -= size; + while (size) { + if (x + size >= width) { + y++; + size -= (width - x); + x = 0; + } else { + x += size; + size = 0; + } + } + } +} + +static void xan_wc4_decode_frame(XanContext *s) { +} + +static int xan_decode_frame(AVCodecContext *avctx, + void *data, int *data_size, + uint8_t *buf, int buf_size) +{ + XanContext *s = avctx->priv_data; + unsigned char *palette_control = avctx->extradata; + int keyframe = 0; + + if (palette_control[0]) { + /* load the new palette and reset the palette control */ + xan_wc3_build_palette(s, &palette_control[1]); + palette_control[0] = 0; + keyframe = 1; + } + + if (avctx->get_buffer(avctx, &s->current_frame)) { + printf (" Interplay Video: get_buffer() failed\n"); + return -1; + } + + s->buf = buf; + s->size = buf_size; + + if (avctx->codec->id == CODEC_ID_XAN_WC3) { +// if (keyframe) + if (1) + xan_wc3_decode_frame(s); + else { + memcpy(s->current_frame.data[0], s->last_frame.data[0], + s->current_frame.linesize[0] * avctx->height); + memcpy(s->current_frame.data[1], s->last_frame.data[1], + s->current_frame.linesize[1] * avctx->height); + memcpy(s->current_frame.data[2], s->last_frame.data[2], + s->current_frame.linesize[2] * avctx->height); + } + } else if (avctx->codec->id == CODEC_ID_XAN_WC4) + xan_wc4_decode_frame(s); + + /* release the last frame if it is allocated */ + if (s->last_frame.data[0]) + avctx->release_buffer(avctx, &s->last_frame); + + /* shuffle frames */ + s->last_frame = s->current_frame; + + *data_size = sizeof(AVFrame); + *(AVFrame*)data = s->current_frame; + + /* always report that the buffer was completely consumed */ + return buf_size; +} + +static int xan_decode_end(AVCodecContext *avctx) +{ + XanContext *s = avctx->priv_data; + + /* release the last frame */ + avctx->release_buffer(avctx, &s->last_frame); + + av_free(s->buffer1); + av_free(s->buffer2); + + return 0; +} + +AVCodec xan_wc3_decoder = { + "xan_wc3", + CODEC_TYPE_VIDEO, + CODEC_ID_XAN_WC3, + sizeof(XanContext), + xan_decode_init, + NULL, + xan_decode_end, + xan_decode_frame, + CODEC_CAP_DR1, +}; + +/* +AVCodec xan_wc4_decoder = { + "xan_wc4", + CODEC_TYPE_VIDEO, + CODEC_ID_XAN_WC4, + sizeof(XanContext), + xan_decode_init, + NULL, + xan_decode_end, + xan_decode_frame, + CODEC_CAP_DR1, +}; +*/ |
