diff options
author | Kostya Shishkov <kostya.shishkov@gmail.com> | 2007-03-14 14:49:49 +0000 |
---|---|---|
committer | Kostya Shishkov <kostya.shishkov@gmail.com> | 2007-03-14 14:49:49 +0000 |
commit | 33a0dd378abd98647700a296e5869146de74ed1c (patch) | |
tree | 8ae0c2e7eb6a691b95fcf169043a950d551f76a4 | |
parent | 0769498a9f37c651860e5b90ea65dc92937532ef (diff) | |
download | ffmpeg-33a0dd378abd98647700a296e5869146de74ed1c.tar.gz |
DXA demuxer and decoder
Originally committed as revision 8405 to svn://svn.ffmpeg.org/ffmpeg/trunk
-rw-r--r-- | Changelog | 1 | ||||
-rw-r--r-- | MAINTAINERS | 2 | ||||
-rwxr-xr-x | configure | 1 | ||||
-rw-r--r-- | doc/ffmpeg-doc.texi | 4 | ||||
-rw-r--r-- | libavcodec/Makefile | 1 | ||||
-rw-r--r-- | libavcodec/allcodecs.c | 1 | ||||
-rw-r--r-- | libavcodec/avcodec.h | 6 | ||||
-rw-r--r-- | libavcodec/dxa.c | 333 | ||||
-rw-r--r-- | libavformat/Makefile | 1 | ||||
-rw-r--r-- | libavformat/allformats.c | 1 | ||||
-rw-r--r-- | libavformat/allformats.h | 1 | ||||
-rw-r--r-- | libavformat/avformat.h | 4 | ||||
-rw-r--r-- | libavformat/dxa.c | 214 |
13 files changed, 566 insertions, 4 deletions
@@ -73,6 +73,7 @@ version <next> - WMA encoder - GSM-MS encoder and decoder - DCA decoder +- DXA demuxer and decoder version 0.4.9-pre1: diff --git a/MAINTAINERS b/MAINTAINERS index abd597b661..188c1de779 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -114,6 +114,7 @@ Codecs: cook.c, cookdata.h Benjamin Larsson cscd.c Reimar Doeffinger dpcm.c Mike Melanson + dxa.c Kostya Shishkov dv.c Roman Shaposhnik ffv1.c Michael Niedermayer flac.c Alex Beregszaszi @@ -202,6 +203,7 @@ Muxers/Demuxers: crc.c Michael Niedermayer daud.c Reimar Doeffinger dc1394.c, dv.c Roman Shaposhnik + dxa.c Kostya Shishkov flic.c Mike Melanson flvdec.c, flvenc.c Michael Niedermayer gxf.c Reimar Doeffinger @@ -644,6 +644,7 @@ CMDLINE_SELECT=" static " +dxa_decoder_deps="zlib" flashsv_decoder_deps="zlib" flashsv_encoder_deps="zlib" mpeg_xvmc_decoder_deps="xvmc" diff --git a/doc/ffmpeg-doc.texi b/doc/ffmpeg-doc.texi index 3baae2fbe2..f582755f45 100644 --- a/doc/ffmpeg-doc.texi +++ b/doc/ffmpeg-doc.texi @@ -898,6 +898,9 @@ library: @tab Material eXchange Format SMPTE 377M, used by D-Cinema, broadcast industry. @item SEQ @tab @tab X @tab Tiertex .seq files used in the DOS CDROM version of the game Flashback. +@item DXA @tab @tab X +@tab This format is used in non-Windows version of Feeble Files game and +different game cutscenes repacked for use with ScummVM. @end multitable @code{X} means that encoding (resp. decoding) is supported. @@ -1005,6 +1008,7 @@ following image formats are supported: @item VMware Video @tab @tab X @tab Codec used in videos captured by VMware. @item Cin Video @tab @tab X @tab Codec used in Delphine Software games. @item Tiertex Seq Video @tab @tab X @tab Codec used in DOS CDROM FlashBack game. +@item DXA Video @tab @tab X @tab Codec originally used in Feeble Files game. @end multitable @code{X} means that encoding (resp. decoding) is supported. diff --git a/libavcodec/Makefile b/libavcodec/Makefile index 9a56889551..4f7bd62cf4 100644 --- a/libavcodec/Makefile +++ b/libavcodec/Makefile @@ -72,6 +72,7 @@ OBJS-$(CONFIG_DVDSUB_DECODER) += dvdsubdec.o OBJS-$(CONFIG_DVDSUB_ENCODER) += dvdsubenc.o OBJS-$(CONFIG_DVVIDEO_DECODER) += dv.o OBJS-$(CONFIG_DVVIDEO_ENCODER) += dv.o +OBJS-$(CONFIG_DXA_DECODER) += dxa.o OBJS-$(CONFIG_EIGHTBPS_DECODER) += 8bps.o OBJS-$(CONFIG_FFV1_DECODER) += ffv1.o OBJS-$(CONFIG_FFV1_ENCODER) += ffv1.o diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c index ff2d6e5cde..daad1bf575 100644 --- a/libavcodec/allcodecs.c +++ b/libavcodec/allcodecs.c @@ -67,6 +67,7 @@ void avcodec_register_all(void) REGISTER_DECODER(DCA, dca); REGISTER_DECODER(DSICINVIDEO, dsicinvideo); REGISTER_ENCDEC (DVVIDEO, dvvideo); + REGISTER_DECODER(DXA, dxa); REGISTER_DECODER(EIGHTBPS, eightbps); REGISTER_ENCDEC (FFV1, ffv1); REGISTER_ENCDEC (FFVHUFF, ffvhuff); diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h index 1c24dda94c..a2e872f6cc 100644 --- a/libavcodec/avcodec.h +++ b/libavcodec/avcodec.h @@ -37,8 +37,8 @@ extern "C" { #define AV_STRINGIFY(s) AV_TOSTRING(s) #define AV_TOSTRING(s) #s -#define LIBAVCODEC_VERSION_INT ((51<<16)+(38<<8)+0) -#define LIBAVCODEC_VERSION 51.38.0 +#define LIBAVCODEC_VERSION_INT ((51<<16)+(39<<8)+0) +#define LIBAVCODEC_VERSION 51.39.0 #define LIBAVCODEC_BUILD LIBAVCODEC_VERSION_INT #define LIBAVCODEC_IDENT "Lavc" AV_STRINGIFY(LIBAVCODEC_VERSION) @@ -150,6 +150,7 @@ enum CodecID { CODEC_ID_TIFF, CODEC_ID_GIF, CODEC_ID_FFH264, + CODEC_ID_DXA, /* various pcm "codecs" */ CODEC_ID_PCM_S16LE= 0x10000, @@ -2232,6 +2233,7 @@ extern AVCodec dca_decoder; extern AVCodec dsicinaudio_decoder; extern AVCodec dsicinvideo_decoder; extern AVCodec dvvideo_decoder; +extern AVCodec dxa_decoder; extern AVCodec eightbps_decoder; extern AVCodec ffv1_decoder; extern AVCodec ffvhuff_decoder; diff --git a/libavcodec/dxa.c b/libavcodec/dxa.c new file mode 100644 index 0000000000..fc201ccb4a --- /dev/null +++ b/libavcodec/dxa.c @@ -0,0 +1,333 @@ +/* + * Feeble Files/ScummVM DXA decoder + * Copyright (c) 2007 Konstantin Shishkov + * + * This file is part of FFmpeg. + * + * FFmpeg 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 2.1 of the License, or (at your option) any later version. + * + * FFmpeg 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 FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + * + */ + +/** + * @file dxa.c + * DXA Video decoder + */ + +#include <stdio.h> +#include <stdlib.h> + +#include "common.h" +#include "avcodec.h" + +#include <zlib.h> + +/* + * Decoder context + */ +typedef struct DxaDecContext { + AVCodecContext *avctx; + AVFrame pic, prev; + + int dsize; + uint8_t *decomp_buf; + uint32_t pal[256]; +} DxaDecContext; + +static const int shift1[6] = { 0, 8, 8, 8, 4, 4 }; +static const int shift2[6] = { 0, 0, 8, 4, 0, 4 }; + +static int decode_13(AVCodecContext *avctx, DxaDecContext *c, uint8_t* dst, uint8_t *src, uint8_t *ref) +{ + uint8_t *code, *data, *mv, *msk, *tmp, *tmp2; + int i, j, k; + int type, x, y, d, d2; + int stride = c->pic.linesize[0]; + uint32_t mask; + + code = src + 12; + data = code + ((avctx->width * avctx->height) >> 4); + mv = data + AV_RB32(src + 0); + msk = mv + AV_RB32(src + 4); + + for(j = 0; j < avctx->height; j += 4){ + for(i = 0; i < avctx->width; i += 4){ + tmp = dst + i; + tmp2 = ref + i; + type = *code++; + switch(type){ + case 4: // motion compensation + x = (*mv) >> 4; if(x & 8) x = 8 - x; + y = (*mv++) & 0xF; if(y & 8) y = 8 - y; + tmp2 += x + y*stride; + case 0: // skip + case 5: // skip in method 12 + for(y = 0; y < 4; y++){ + memcpy(tmp, tmp2, 4); + tmp += stride; + tmp2 += stride; + } + break; + case 1: // masked change + case 10: // masked change with only half of pixels changed + case 11: // cases 10-15 are for method 12 only + case 12: + case 13: + case 14: + case 15: + if(type == 1){ + mask = AV_RB16(msk); + msk += 2; + }else{ + type -= 10; + mask = ((msk[0] & 0xF0) << shift1[type]) | ((msk[0] & 0xF) << shift2[type]); + msk++; + } + for(y = 0; y < 4; y++){ + for(x = 0; x < 4; x++){ + tmp[x] = (mask & 0x8000) ? *data++ : tmp2[x]; + mask <<= 1; + } + tmp += stride; + tmp2 += stride; + } + break; + case 2: // fill block + for(y = 0; y < 4; y++){ + memset(tmp, data[0], 4); + tmp += stride; + } + data++; + break; + case 3: // raw block + for(y = 0; y < 4; y++){ + memcpy(tmp, data, 4); + data += 4; + tmp += stride; + } + break; + case 8: // subblocks - method 13 only + mask = *msk++; + for(k = 0; k < 4; k++){ + d = ((k & 1) << 1) + ((k & 2) * stride); + d2 = ((k & 1) << 1) + ((k & 2) * stride); + tmp2 = ref + i + d2; + switch(mask & 0xC0){ + case 0x80: // motion compensation + x = (*mv) >> 4; if(x & 8) x = 8 - x; + y = (*mv++) & 0xF; if(y & 8) y = 8 - y; + tmp2 += x + y*stride; + case 0x00: // skip + tmp[d + 0 ] = tmp2[0]; + tmp[d + 1 ] = tmp2[1]; + tmp[d + 0 + stride] = tmp2[0 + stride]; + tmp[d + 1 + stride] = tmp2[1 + stride]; + break; + case 0x40: // fill + tmp[d + 0 ] = data[0]; + tmp[d + 1 ] = data[0]; + tmp[d + 0 + stride] = data[0]; + tmp[d + 1 + stride] = data[0]; + data++; + break; + case 0xC0: // raw + tmp[d + 0 ] = *data++; + tmp[d + 1 ] = *data++; + tmp[d + 0 + stride] = *data++; + tmp[d + 1 + stride] = *data++; + break; + } + mask <<= 2; + } + break; + case 32: // vector quantization - 2 colors + mask = AV_RB16(msk); + msk += 2; + for(y = 0; y < 4; y++){ + for(x = 0; x < 4; x++){ + tmp[x] = data[mask & 1]; + mask >>= 1; + } + tmp += stride; + tmp2 += stride; + } + data += 2; + break; + case 33: // vector quantization - 3 or 4 colors + case 34: + mask = AV_RB32(msk); + msk += 4; + for(y = 0; y < 4; y++){ + for(x = 0; x < 4; x++){ + tmp[x] = data[mask & 3]; + mask >>= 2; + } + tmp += stride; + tmp2 += stride; + } + data += type - 30; + break; + default: + av_log(avctx, AV_LOG_ERROR, "Unknown opcode %d\n", type); + return -1; + } + } + dst += stride * 4; + ref += stride * 4; + } + return 0; +} + +static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size) +{ + DxaDecContext * const c = (DxaDecContext *)avctx->priv_data; + uint8_t *outptr, *srcptr, *tmpptr; + unsigned long dsize; + int i, j, compr; + int stride; + int orig_buf_size = buf_size; + int pc = 0; + + /* make the palette available on the way out */ + if(buf[0]=='C' && buf[1]=='M' && buf[2]=='A' && buf[3]=='P'){ + int r, g, b; + + buf += 4; + for(i = 0; i < 256; i++){ + r = *buf++; + g = *buf++; + b = *buf++; + c->pal[i] = (r << 16) | (g << 8) | b; + } + pc = 1; + buf_size -= 768+4; + } + + if(avctx->get_buffer(avctx, &c->pic) < 0){ + av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); + return -1; + } + memcpy(c->pic.data[1], c->pal, AVPALETTE_SIZE); + c->pic.palette_has_changed = pc; + + outptr = c->pic.data[0]; + srcptr = c->decomp_buf; + tmpptr = c->prev.data[0]; + stride = c->pic.linesize[0]; + + if(buf[0]=='N' && buf[1]=='U' && buf[2]=='L' && buf[3]=='L') + compr = -1; + else + compr = buf[4]; + + dsize = c->dsize; + if((compr != 4 && compr != -1) && uncompress(c->decomp_buf, &dsize, buf + 9, buf_size - 9) != Z_OK){ + av_log(avctx, AV_LOG_ERROR, "Uncompress failed!\n"); + return -1; + } + switch(compr){ + case -1: + c->pic.key_frame = 0; + c->pic.pict_type = FF_P_TYPE; + if(c->prev.data[0]) + memcpy(c->pic.data[0], c->prev.data[0], c->pic.linesize[0] * avctx->height); + else{ // Should happen only when first frame is 'NULL' + memset(c->pic.data[0], 0, c->pic.linesize[0] * avctx->height); + c->pic.key_frame = 1; + c->pic.pict_type = FF_I_TYPE; + } + break; + case 2: + case 3: + case 4: + case 5: + c->pic.key_frame = !(compr & 1); + c->pic.pict_type = (compr & 1) ? FF_P_TYPE : FF_I_TYPE; + for(j = 0; j < avctx->height; j++){ + if(compr & 1){ + for(i = 0; i < avctx->width; i++) + outptr[i] = srcptr[i] ^ tmpptr[i]; + tmpptr += stride; + }else + memcpy(outptr, srcptr, avctx->width); + outptr += stride; + srcptr += avctx->width; + } + break; + case 12: // ScummVM coding + case 13: + c->pic.key_frame = 0; + c->pic.pict_type = FF_P_TYPE; + decode_13(avctx, c, c->pic.data[0], srcptr, c->prev.data[0]); + break; + default: + av_log(avctx, AV_LOG_ERROR, "Unknown/unsupported compression type %d\n", buf[4]); + return -1; + } + + FFSWAP(AVFrame, c->pic, c->prev); + if(c->pic.data[0]) + avctx->release_buffer(avctx, &c->pic); + + *data_size = sizeof(AVFrame); + *(AVFrame*)data = c->prev; + + /* always report that the buffer was completely consumed */ + return orig_buf_size; +} + +static int decode_init(AVCodecContext *avctx) +{ + DxaDecContext * const c = (DxaDecContext *)avctx->priv_data; + + c->avctx = avctx; + avctx->pix_fmt = PIX_FMT_PAL8; + + if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) { + return -1; + } + + c->dsize = avctx->width * avctx->height * 2; + if((c->decomp_buf = av_malloc(c->dsize)) == NULL) { + av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n"); + return -1; + } + + return 0; +} + +static int decode_end(AVCodecContext *avctx) +{ + DxaDecContext * const c = (DxaDecContext *)avctx->priv_data; + + av_freep(&c->decomp_buf); + if(c->prev.data[0]) + avctx->release_buffer(avctx, &c->prev); + if(c->pic.data[0]) + avctx->release_buffer(avctx, &c->pic); + + return 0; +} + +AVCodec dxa_decoder = { + "dxa", + CODEC_TYPE_VIDEO, + CODEC_ID_DXA, + sizeof(DxaDecContext), + decode_init, + NULL, + decode_end, + decode_frame +}; + diff --git a/libavformat/Makefile b/libavformat/Makefile index 1a9afb83e7..1ebe89880a 100644 --- a/libavformat/Makefile +++ b/libavformat/Makefile @@ -34,6 +34,7 @@ OBJS-$(CONFIG_DSICIN_DEMUXER) += dsicin.o OBJS-$(CONFIG_DV_DEMUXER) += dv.o OBJS-$(CONFIG_DV_MUXER) += dvenc.o OBJS-$(CONFIG_DV1394_DEMUXER) += dv1394.o +OBJS-$(CONFIG_DXA_DEMUXER) += dxa.o OBJS-$(CONFIG_EA_DEMUXER) += electronicarts.o OBJS-$(CONFIG_FFM_DEMUXER) += ffm.o OBJS-$(CONFIG_FFM_MUXER) += ffm.o diff --git a/libavformat/allformats.c b/libavformat/allformats.c index 2f0d8601bd..55654839ab 100644 --- a/libavformat/allformats.c +++ b/libavformat/allformats.c @@ -65,6 +65,7 @@ void av_register_all(void) REGISTER_DEMUXER (DTS, dts); REGISTER_MUXDEMUX(DV, dv); REGISTER_DEMUXER (DV1394, dv1394); + REGISTER_DEMUXER (DXA, dxa); REGISTER_DEMUXER (EA, ea); REGISTER_MUXDEMUX(FFM, ffm); REGISTER_MUXDEMUX(FLAC, flac); diff --git a/libavformat/allformats.h b/libavformat/allformats.h index 5603a29531..d2969aa423 100644 --- a/libavformat/allformats.h +++ b/libavformat/allformats.h @@ -47,6 +47,7 @@ extern AVInputFormat dsicin_demuxer; extern AVInputFormat dv1394_demuxer; extern AVInputFormat dv_demuxer; extern AVOutputFormat dv_muxer; +extern AVInputFormat dxa_demuxer; extern AVInputFormat ea_demuxer; extern AVInputFormat ffm_demuxer; extern AVOutputFormat ffm_muxer; diff --git a/libavformat/avformat.h b/libavformat/avformat.h index f1b29b3fbd..eb8c4e1534 100644 --- a/libavformat/avformat.h +++ b/libavformat/avformat.h @@ -25,8 +25,8 @@ extern "C" { #endif -#define LIBAVFORMAT_VERSION_INT ((51<<16)+(10<<8)+0) -#define LIBAVFORMAT_VERSION 51.10.0 +#define LIBAVFORMAT_VERSION_INT ((51<<16)+(11<<8)+0) +#define LIBAVFORMAT_VERSION 51.11.0 #define LIBAVFORMAT_BUILD LIBAVFORMAT_VERSION_INT #define LIBAVFORMAT_IDENT "Lavf" AV_STRINGIFY(LIBAVFORMAT_VERSION) diff --git a/libavformat/dxa.c b/libavformat/dxa.c new file mode 100644 index 0000000000..f49d3d4acf --- /dev/null +++ b/libavformat/dxa.c @@ -0,0 +1,214 @@ +/* + * DXA demuxer + * Copyright (c) 2007 Konstantin Shishkov. + * + * This file is part of FFmpeg. + * + * FFmpeg 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 2.1 of the License, or (at your option) any later version. + * + * FFmpeg 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 FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "avformat.h" +#include "riff.h" + +#define DXA_EXTRA_SIZE 9 + +typedef struct{ + int frames; + int has_sound; + int bpc; + uint32_t bytes_left; + int64_t wavpos, vidpos; + int readvid; +}DXAContext; + +static int dxa_probe(AVProbeData *p) +{ + /* check file header */ + if (p->buf_size <= 4) + return 0; + if (p->buf[0] == 'D' && p->buf[1] == 'E' && + p->buf[2] == 'X' && p->buf[3] == 'A') + return AVPROBE_SCORE_MAX; + else + return 0; +} + +static int dxa_read_header(AVFormatContext *s, AVFormatParameters *ap) +{ + ByteIOContext *pb = &s->pb; + DXAContext *c = s->priv_data; + AVStream *st, *ast; + uint32_t tag; + int32_t fps; + int w, h; + int num, den; + int flags; + + tag = get_le32(pb); + if (tag != MKTAG('D', 'E', 'X', 'A')) + return -1; + flags = get_byte(pb); + c->frames = get_be16(pb); + if(!c->frames){ + av_log(s, AV_LOG_ERROR, "File contains no frames ???\n"); + return -1; + } + + fps = get_be32(pb); + if(fps > 0){ + den = 1000; + num = fps; + }else if (fps < 0){ + den = 100000; + num = -fps; + }else{ + den = 10; + num = 1; + } + w = get_be16(pb); + h = get_be16(pb); + c->has_sound = 0; + + st = av_new_stream(s, 0); + if (!st) + return -1; + + // Parse WAV data header + if(get_le32(pb) == MKTAG('W', 'A', 'V', 'E')){ + uint32_t size, fsize; + c->has_sound = 1; + size = get_be32(pb); + c->vidpos = url_ftell(pb) + size; + url_fskip(pb, 16); + fsize = get_le32(pb); + + ast = av_new_stream(s, 0); + if (!ast) + return -1; + get_wav_header(pb, ast->codec, fsize); + // find 'data' chunk + while(url_ftell(pb) < c->vidpos && !url_feof(pb)){ + tag = get_le32(pb); + fsize = get_le32(pb); + if(tag == MKTAG('d', 'a', 't', 'a')) break; + url_fskip(pb, fsize); + } + c->bpc = (fsize + c->frames - 1) / c->frames; + if(ast->codec->block_align) + c->bpc = ((c->bpc + ast->codec->block_align - 1) / ast->codec->block_align) * ast->codec->block_align; + c->bytes_left = fsize; + c->wavpos = url_ftell(pb); + url_fseek(pb, c->vidpos, SEEK_SET); + } + + /* now we are ready: build format streams */ + st->codec->codec_type = CODEC_TYPE_VIDEO; + st->codec->codec_id = CODEC_ID_DXA; + st->codec->width = w; + st->codec->height = h; + av_reduce(&den, &num, den, num, (1UL<<31)-1); + av_set_pts_info(st, 33, num, den); + /* flags & 0x80 means that image is interlaced, + * flags & 0x40 means that image has double height + * either way set true height + */ + if(flags & 0xC0){ + st->codec->height >>= 1; + } + c->readvid = !c->has_sound; + c->vidpos = url_ftell(pb); + s->start_time = 0; + s->duration = (int64_t)c->frames * AV_TIME_BASE * num / den; + av_log(s, AV_LOG_DEBUG, "%d frame(s)\n",c->frames); + + return 0; +} + +static int dxa_read_packet(AVFormatContext *s, AVPacket *pkt) +{ + DXAContext *c = s->priv_data; + int ret; + uint32_t size; + uint8_t buf[DXA_EXTRA_SIZE], pal[768+4]; + int pal_size = 0; + + if(!c->readvid && c->has_sound && c->bytes_left){ + c->readvid = 1; + url_fseek(&s->pb, c->wavpos, SEEK_SET); + size = FFMIN(c->bytes_left, c->bpc); + ret = av_get_packet(&s->pb, pkt, size); + pkt->stream_index = 1; + if(ret != size) + return AVERROR_IO; + c->bytes_left -= size; + c->wavpos = url_ftell(&s->pb); + return 0; + } + url_fseek(&s->pb, c->vidpos, SEEK_SET); + while(!url_feof(&s->pb) && c->frames){ + get_buffer(&s->pb, buf, 4); + switch(AV_RL32(buf)){ + case MKTAG('N', 'U', 'L', 'L'): + if(av_new_packet(pkt, 4 + pal_size) < 0) + return AVERROR_NOMEM; + pkt->stream_index = 0; + if(pal_size) memcpy(pkt->data, pal, pal_size); + memcpy(pkt->data + pal_size, buf, 4); + c->frames--; + c->vidpos = url_ftell(&s->pb); + c->readvid = 0; + return 0; + case MKTAG('C', 'M', 'A', 'P'): + pal_size = 768+4; + memcpy(pal, buf, 4); + get_buffer(&s->pb, pal + 4, 768); + break; + case MKTAG('F', 'R', 'A', 'M'): + get_buffer(&s->pb, buf + 4, DXA_EXTRA_SIZE - 4); + size = AV_RB32(buf + 5); + if(size > 0xFFFFFF){ + av_log(s, AV_LOG_ERROR, "Frame size is too big: %d\n", size); + return -1; + } + if(av_new_packet(pkt, size + DXA_EXTRA_SIZE + pal_size) < 0) + return AVERROR_NOMEM; + memcpy(pkt->data + pal_size, buf, DXA_EXTRA_SIZE); + ret = get_buffer(&s->pb, pkt->data + DXA_EXTRA_SIZE + pal_size, size); + if(ret != size){ + av_free_packet(pkt); + return AVERROR_IO; + } + if(pal_size) memcpy(pkt->data, pal, pal_size); + pkt->stream_index = 0; + c->frames--; + c->vidpos = url_ftell(&s->pb); + c->readvid = 0; + return 0; + default: + av_log(s, AV_LOG_ERROR, "Unknown tag %c%c%c%c\n", buf[0], buf[1], buf[2], buf[3]); + return -1; + } + } + return AVERROR(EIO); +} + +AVInputFormat dxa_demuxer = { + "dxa", + "dxa", + sizeof(DXAContext), + dxa_probe, + dxa_read_header, + dxa_read_packet, +}; |