diff options
Diffstat (limited to 'contrib/ffmpeg/libavformat/avidec.c')
| -rw-r--r-- | contrib/ffmpeg/libavformat/avidec.c | 1018 |
1 files changed, 0 insertions, 1018 deletions
diff --git a/contrib/ffmpeg/libavformat/avidec.c b/contrib/ffmpeg/libavformat/avidec.c deleted file mode 100644 index 23c130ab7..000000000 --- a/contrib/ffmpeg/libavformat/avidec.c +++ /dev/null @@ -1,1018 +0,0 @@ -/* - * AVI demuxer - * Copyright (c) 2001 Fabrice Bellard. - * - * 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 "avi.h" -#include "dv.h" -#include "riff.h" - -#undef NDEBUG -#include <assert.h> - -//#define DEBUG -//#define DEBUG_SEEK - -typedef struct AVIStream { - int64_t frame_offset; /* current frame (video) or byte (audio) counter - (used to compute the pts) */ - int remaining; - int packet_size; - - int scale; - int rate; - int sample_size; /* size of one sample (or packet) (in the rate/scale sense) in bytes */ - - int64_t cum_len; /* temporary storage (used during seek) */ - - int prefix; ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b' - int prefix_count; -} AVIStream; - -typedef struct { - int64_t riff_end; - int64_t movi_end; - offset_t movi_list; - int index_loaded; - int is_odml; - int non_interleaved; - int stream_index; - DVDemuxContext* dv_demux; -} AVIContext; - -static int avi_load_index(AVFormatContext *s); -static int guess_ni_flag(AVFormatContext *s); - -#ifdef DEBUG -static void print_tag(const char *str, unsigned int tag, int size) -{ - printf("%s: tag=%c%c%c%c size=0x%x\n", - str, tag & 0xff, - (tag >> 8) & 0xff, - (tag >> 16) & 0xff, - (tag >> 24) & 0xff, - size); -} -#endif - -static int get_riff(AVIContext *avi, ByteIOContext *pb) -{ - uint32_t tag; - /* check RIFF header */ - tag = get_le32(pb); - - if (tag != MKTAG('R', 'I', 'F', 'F')) - return -1; - avi->riff_end = get_le32(pb); /* RIFF chunk size */ - avi->riff_end += url_ftell(pb); /* RIFF chunk end */ - tag = get_le32(pb); - if(tag == MKTAG('A', 'V', 'I', 0x19)) - av_log(NULL, AV_LOG_INFO, "file has been generated with a totally broken muxer\n"); - else - if (tag != MKTAG('A', 'V', 'I', ' ') && tag != MKTAG('A', 'V', 'I', 'X')) - return -1; - - return 0; -} - -static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){ - AVIContext *avi = s->priv_data; - ByteIOContext *pb = &s->pb; - int longs_pre_entry= get_le16(pb); - int index_sub_type = get_byte(pb); - int index_type = get_byte(pb); - int entries_in_use = get_le32(pb); - int chunk_id = get_le32(pb); - int64_t base = get_le64(pb); - int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0'); - AVStream *st; - AVIStream *ast; - int i; - int64_t last_pos= -1; - int64_t filesize= url_fsize(&s->pb); - -#ifdef DEBUG_SEEK - av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n", - longs_pre_entry,index_type, entries_in_use, chunk_id, base); -#endif - - if(stream_id > s->nb_streams || stream_id < 0) - return -1; - st= s->streams[stream_id]; - ast = st->priv_data; - - if(index_sub_type) - return -1; - - get_le32(pb); - - if(index_type && longs_pre_entry != 2) - return -1; - if(index_type>1) - return -1; - - if(filesize > 0 && base >= filesize){ - av_log(s, AV_LOG_ERROR, "ODML index invalid\n"); - if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF) - base &= 0xFFFFFFFF; - else - return -1; - } - - for(i=0; i<entries_in_use; i++){ - if(index_type){ - int64_t pos= get_le32(pb) + base - 8; - int len = get_le32(pb); - int key= len >= 0; - len &= 0x7FFFFFFF; - -#ifdef DEBUG_SEEK - av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len); -#endif - if(last_pos == pos || pos == base - 8) - avi->non_interleaved= 1; - else - av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, key ? AVINDEX_KEYFRAME : 0); - - if(ast->sample_size) - ast->cum_len += len; - else - ast->cum_len ++; - last_pos= pos; - }else{ - int64_t offset, pos; - int duration; - offset = get_le64(pb); - get_le32(pb); /* size */ - duration = get_le32(pb); - pos = url_ftell(pb); - - url_fseek(pb, offset+8, SEEK_SET); - read_braindead_odml_indx(s, frame_num); - frame_num += duration; - - url_fseek(pb, pos, SEEK_SET); - } - } - avi->index_loaded=1; - return 0; -} - -static void clean_index(AVFormatContext *s){ - int i; - int64_t j; - - for(i=0; i<s->nb_streams; i++){ - AVStream *st = s->streams[i]; - AVIStream *ast = st->priv_data; - int n= st->nb_index_entries; - int max= ast->sample_size; - int64_t pos, size, ts; - - if(n != 1 || ast->sample_size==0) - continue; - - while(max < 1024) max+=max; - - pos= st->index_entries[0].pos; - size= st->index_entries[0].size; - ts= st->index_entries[0].timestamp; - - for(j=0; j<size; j+=max){ - av_add_index_entry(st, pos+j, ts + j/ast->sample_size, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME); - } - } -} - -static int avi_read_tag(ByteIOContext *pb, char *buf, int maxlen, unsigned int size) -{ - offset_t i = url_ftell(pb); - size += (size & 1); - get_strz(pb, buf, maxlen); - url_fseek(pb, i+size, SEEK_SET); - return 0; -} - -static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap) -{ - AVIContext *avi = s->priv_data; - ByteIOContext *pb = &s->pb; - uint32_t tag, tag1, handler; - int codec_type, stream_index, frame_period, bit_rate; - unsigned int size, nb_frames; - int i; - AVStream *st; - AVIStream *ast = NULL; - char str_track[4]; - - avi->stream_index= -1; - - if (get_riff(avi, pb) < 0) - return -1; - - /* first list tag */ - stream_index = -1; - codec_type = -1; - frame_period = 0; - for(;;) { - if (url_feof(pb)) - goto fail; - tag = get_le32(pb); - size = get_le32(pb); -#ifdef DEBUG - print_tag("tag", tag, size); -#endif - - switch(tag) { - case MKTAG('L', 'I', 'S', 'T'): - /* ignored, except when start of video packets */ - tag1 = get_le32(pb); -#ifdef DEBUG - print_tag("list", tag1, 0); -#endif - if (tag1 == MKTAG('m', 'o', 'v', 'i')) { - avi->movi_list = url_ftell(pb) - 4; - if(size) avi->movi_end = avi->movi_list + size + (size & 1); - else avi->movi_end = url_fsize(pb); -#ifdef DEBUG - printf("movi end=%"PRIx64"\n", avi->movi_end); -#endif - goto end_of_header; - } - break; - case MKTAG('d', 'm', 'l', 'h'): - avi->is_odml = 1; - url_fskip(pb, size + (size & 1)); - break; - case MKTAG('a', 'v', 'i', 'h'): - /* avi header */ - /* using frame_period is bad idea */ - frame_period = get_le32(pb); - bit_rate = get_le32(pb) * 8; - get_le32(pb); - avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX; - - url_fskip(pb, 2 * 4); - get_le32(pb); - - url_fskip(pb, size - 7 * 4); - break; - case MKTAG('s', 't', 'r', 'h'): - /* stream header */ - - tag1 = get_le32(pb); - handler = get_le32(pb); /* codec tag */ - - if(tag1 == MKTAG('p', 'a', 'd', 's')){ - url_fskip(pb, size - 8); - break; - }else{ - stream_index++; - st = av_new_stream(s, stream_index); - if (!st) - goto fail; - - ast = av_mallocz(sizeof(AVIStream)); - if (!ast) - goto fail; - st->priv_data = ast; - } - -#ifdef DEBUG - print_tag("strh", tag1, -1); -#endif - if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){ - int64_t dv_dur; - - /* - * After some consideration -- I don't think we - * have to support anything but DV in a type1 AVIs. - */ - if (s->nb_streams != 1) - goto fail; - - if (handler != MKTAG('d', 'v', 's', 'd') && - handler != MKTAG('d', 'v', 'h', 'd') && - handler != MKTAG('d', 'v', 's', 'l')) - goto fail; - - ast = s->streams[0]->priv_data; - av_freep(&s->streams[0]->codec->extradata); - av_freep(&s->streams[0]); - s->nb_streams = 0; - if (ENABLE_DV_DEMUXER) { - avi->dv_demux = dv_init_demux(s); - if (!avi->dv_demux) - goto fail; - } - s->streams[0]->priv_data = ast; - url_fskip(pb, 3 * 4); - ast->scale = get_le32(pb); - ast->rate = get_le32(pb); - url_fskip(pb, 4); /* start time */ - - dv_dur = get_le32(pb); - if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) { - dv_dur *= AV_TIME_BASE; - s->duration = av_rescale(dv_dur, ast->scale, ast->rate); - } - /* - * else, leave duration alone; timing estimation in utils.c - * will make a guess based on bit rate. - */ - - stream_index = s->nb_streams - 1; - url_fskip(pb, size - 9*4); - break; - } - - assert(stream_index < s->nb_streams); - st->codec->stream_codec_tag= handler; - - get_le32(pb); /* flags */ - get_le16(pb); /* priority */ - get_le16(pb); /* language */ - get_le32(pb); /* initial frame */ - ast->scale = get_le32(pb); - ast->rate = get_le32(pb); - if(ast->scale && ast->rate){ - }else if(frame_period){ - ast->rate = 1000000; - ast->scale = frame_period; - }else{ - ast->rate = 25; - ast->scale = 1; - } - av_set_pts_info(st, 64, ast->scale, ast->rate); - - ast->cum_len=get_le32(pb); /* start */ - nb_frames = get_le32(pb); - - st->start_time = 0; - st->duration = nb_frames; - get_le32(pb); /* buffer size */ - get_le32(pb); /* quality */ - ast->sample_size = get_le32(pb); /* sample ssize */ - ast->cum_len *= FFMAX(1, ast->sample_size); -// av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size); - - switch(tag1) { - case MKTAG('v', 'i', 'd', 's'): - codec_type = CODEC_TYPE_VIDEO; - - ast->sample_size = 0; - break; - case MKTAG('a', 'u', 'd', 's'): - codec_type = CODEC_TYPE_AUDIO; - break; - case MKTAG('t', 'x', 't', 's'): - //FIXME - codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ? FIXME - break; - default: - av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1); - goto fail; - } - ast->frame_offset= ast->cum_len; - url_fskip(pb, size - 12 * 4); - break; - case MKTAG('s', 't', 'r', 'f'): - /* stream header */ - if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) { - url_fskip(pb, size); - } else { - st = s->streams[stream_index]; - switch(codec_type) { - case CODEC_TYPE_VIDEO: - get_le32(pb); /* size */ - st->codec->width = get_le32(pb); - st->codec->height = get_le32(pb); - get_le16(pb); /* panes */ - st->codec->bits_per_sample= get_le16(pb); /* depth */ - tag1 = get_le32(pb); - get_le32(pb); /* ImageSize */ - get_le32(pb); /* XPelsPerMeter */ - get_le32(pb); /* YPelsPerMeter */ - get_le32(pb); /* ClrUsed */ - get_le32(pb); /* ClrImportant */ - - if(size > 10*4 && size<(1<<30)){ - st->codec->extradata_size= size - 10*4; - st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE); - get_buffer(pb, st->codec->extradata, st->codec->extradata_size); - } - - if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly - get_byte(pb); - - /* Extract palette from extradata if bpp <= 8 */ - /* This code assumes that extradata contains only palette */ - /* This is true for all paletted codecs implemented in ffmpeg */ - if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) { - st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl)); -#ifdef WORDS_BIGENDIAN - for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++) - st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]); -#else - memcpy(st->codec->palctrl->palette, st->codec->extradata, - FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)); -#endif - st->codec->palctrl->palette_changed = 1; - } - -#ifdef DEBUG - print_tag("video", tag1, 0); -#endif - st->codec->codec_type = CODEC_TYPE_VIDEO; - st->codec->codec_tag = tag1; - st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1); - st->need_parsing = 2; //only parse headers dont do slower repacketization, this is needed to get the pict type which is needed for generating correct pts -// url_fskip(pb, size - 5 * 4); - break; - case CODEC_TYPE_AUDIO: - get_wav_header(pb, st->codec, size); - if(ast->sample_size && st->codec->block_align && ast->sample_size % st->codec->block_align) - av_log(s, AV_LOG_DEBUG, "invalid sample size or block align detected\n"); - if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */ - url_fskip(pb, 1); - /* Force parsing as several audio frames can be in - * one packet. */ - st->need_parsing = 1; - /* ADTS header is in extradata, AAC without header must be stored as exact frames, parser not needed and it will fail */ - if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size) - st->need_parsing = 0; - /* AVI files with Xan DPCM audio (wrongly) declare PCM - * audio in the header but have Axan as stream_code_tag. */ - if (st->codec->stream_codec_tag == ff_get_fourcc("Axan")){ - st->codec->codec_id = CODEC_ID_XAN_DPCM; - st->codec->codec_tag = 0; - } - break; - default: - st->codec->codec_type = CODEC_TYPE_DATA; - st->codec->codec_id= CODEC_ID_NONE; - st->codec->codec_tag= 0; - url_fskip(pb, size); - break; - } - } - break; - case MKTAG('i', 'n', 'd', 'x'): - i= url_ftell(pb); - if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){ - read_braindead_odml_indx(s, 0); - } - url_fseek(pb, i+size, SEEK_SET); - break; - case MKTAG('I', 'N', 'A', 'M'): - avi_read_tag(pb, s->title, sizeof(s->title), size); - break; - case MKTAG('I', 'A', 'R', 'T'): - avi_read_tag(pb, s->author, sizeof(s->author), size); - break; - case MKTAG('I', 'C', 'O', 'P'): - avi_read_tag(pb, s->copyright, sizeof(s->copyright), size); - break; - case MKTAG('I', 'C', 'M', 'T'): - avi_read_tag(pb, s->comment, sizeof(s->comment), size); - break; - case MKTAG('I', 'G', 'N', 'R'): - avi_read_tag(pb, s->genre, sizeof(s->genre), size); - break; - case MKTAG('I', 'P', 'R', 'D'): - avi_read_tag(pb, s->album, sizeof(s->album), size); - break; - case MKTAG('I', 'P', 'R', 'T'): - avi_read_tag(pb, str_track, sizeof(str_track), size); - sscanf(str_track, "%d", &s->track); - break; - default: - if(size > 1000000){ - av_log(s, AV_LOG_ERROR, "well something went wrong during header parsing, " - "ill ignore it and try to continue anyway\n"); - avi->movi_list = url_ftell(pb) - 4; - avi->movi_end = url_fsize(pb); - goto end_of_header; - } - /* skip tag */ - size += (size & 1); - url_fskip(pb, size); - break; - } - } - end_of_header: - /* check stream number */ - if (stream_index != s->nb_streams - 1) { - fail: - for(i=0;i<s->nb_streams;i++) { - av_freep(&s->streams[i]->codec->extradata); - av_freep(&s->streams[i]); - } - return -1; - } - - if(!avi->index_loaded && !url_is_streamed(pb)) - avi_load_index(s); - avi->index_loaded = 1; - avi->non_interleaved |= guess_ni_flag(s); - if(avi->non_interleaved) - clean_index(s); - - return 0; -} - -static int avi_read_packet(AVFormatContext *s, AVPacket *pkt) -{ - AVIContext *avi = s->priv_data; - ByteIOContext *pb = &s->pb; - int n, d[8], size; - offset_t i, sync; - void* dstr; - - if (ENABLE_DV_DEMUXER && avi->dv_demux) { - size = dv_get_packet(avi->dv_demux, pkt); - if (size >= 0) - return size; - } - - if(avi->non_interleaved){ - int best_stream_index = 0; - AVStream *best_st= NULL; - AVIStream *best_ast; - int64_t best_ts= INT64_MAX; - int i; - - for(i=0; i<s->nb_streams; i++){ - AVStream *st = s->streams[i]; - AVIStream *ast = st->priv_data; - int64_t ts= ast->frame_offset; - - if(ast->sample_size) - ts /= ast->sample_size; - ts= av_rescale(ts, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den); - -// av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset); - if(ts < best_ts){ - best_ts= ts; - best_st= st; - best_stream_index= i; - } - } - best_ast = best_st->priv_data; - best_ts= av_rescale(best_ts, best_st->time_base.den, AV_TIME_BASE * (int64_t)best_st->time_base.num); //FIXME a little ugly - if(best_ast->remaining) - i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD); - else - i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY); - -// av_log(NULL, AV_LOG_DEBUG, "%d\n", i); - if(i>=0){ - int64_t pos= best_st->index_entries[i].pos; - pos += best_ast->packet_size - best_ast->remaining; - url_fseek(&s->pb, pos + 8, SEEK_SET); -// av_log(NULL, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos); - - assert(best_ast->remaining <= best_ast->packet_size); - - avi->stream_index= best_stream_index; - if(!best_ast->remaining) - best_ast->packet_size= - best_ast->remaining= best_st->index_entries[i].size; - } - } - -resync: - if(avi->stream_index >= 0){ - AVStream *st= s->streams[ avi->stream_index ]; - AVIStream *ast= st->priv_data; - int size; - - if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM - size= INT_MAX; - else if(ast->sample_size < 32) - size= 64*ast->sample_size; - else - size= ast->sample_size; - - if(size > ast->remaining) - size= ast->remaining; - av_get_packet(pb, pkt, size); - - if (ENABLE_DV_DEMUXER && avi->dv_demux) { - dstr = pkt->destruct; - size = dv_produce_packet(avi->dv_demux, pkt, - pkt->data, pkt->size); - pkt->destruct = dstr; - pkt->flags |= PKT_FLAG_KEY; - } else { - /* XXX: how to handle B frames in avi ? */ - pkt->dts = ast->frame_offset; -// pkt->dts += ast->start; - if(ast->sample_size) - pkt->dts /= ast->sample_size; -//av_log(NULL, AV_LOG_DEBUG, "dts:%"PRId64" offset:%"PRId64" %d/%d smpl_siz:%d base:%d st:%d size:%d\n", pkt->dts, ast->frame_offset, ast->scale, ast->rate, ast->sample_size, AV_TIME_BASE, avi->stream_index, size); - pkt->stream_index = avi->stream_index; - - if (st->codec->codec_type == CODEC_TYPE_VIDEO) { - AVIndexEntry *e; - int index; - assert(st->index_entries); - - index= av_index_search_timestamp(st, pkt->dts, 0); - e= &st->index_entries[index]; - - if(index >= 0 && e->timestamp == ast->frame_offset){ - if (e->flags & AVINDEX_KEYFRAME) - pkt->flags |= PKT_FLAG_KEY; - } - } else { - pkt->flags |= PKT_FLAG_KEY; - } - if(ast->sample_size) - ast->frame_offset += pkt->size; - else - ast->frame_offset++; - } - ast->remaining -= size; - if(!ast->remaining){ - avi->stream_index= -1; - ast->packet_size= 0; - } - - return size; - } - - memset(d, -1, sizeof(int)*8); - for(i=sync=url_ftell(pb); !url_feof(pb); i++) { - int j; - - if (i >= avi->movi_end) { - if (avi->is_odml) { - url_fskip(pb, avi->riff_end - i); - avi->riff_end = avi->movi_end = url_fsize(pb); - } else - break; - } - - for(j=0; j<7; j++) - d[j]= d[j+1]; - d[7]= get_byte(pb); - - size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24); - - if( d[2] >= '0' && d[2] <= '9' - && d[3] >= '0' && d[3] <= '9'){ - n= (d[2] - '0') * 10 + (d[3] - '0'); - }else{ - n= 100; //invalid stream id - } -//av_log(NULL, AV_LOG_DEBUG, "%X %X %X %X %X %X %X %X %"PRId64" %d %d\n", d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n); - if(i + size > avi->movi_end || d[0]<0) - continue; - - //parse ix## - if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams) - //parse JUNK - ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')){ - url_fskip(pb, size); -//av_log(NULL, AV_LOG_DEBUG, "SKIP\n"); - goto resync; - } - - if( d[0] >= '0' && d[0] <= '9' - && d[1] >= '0' && d[1] <= '9'){ - n= (d[0] - '0') * 10 + (d[1] - '0'); - }else{ - n= 100; //invalid stream id - } - - //parse ##dc/##wb - if(n < s->nb_streams){ - AVStream *st; - AVIStream *ast; - st = s->streams[n]; - ast = st->priv_data; - - if( (st->discard >= AVDISCARD_DEFAULT && size==0) - /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering - || st->discard >= AVDISCARD_ALL){ - if(ast->sample_size) ast->frame_offset += pkt->size; - else ast->frame_offset++; - url_fskip(pb, size); - goto resync; - } - - if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) || - d[2]*256+d[3] == ast->prefix /*|| - (d[2] == 'd' && d[3] == 'c') || - (d[2] == 'w' && d[3] == 'b')*/) { - -//av_log(NULL, AV_LOG_DEBUG, "OK\n"); - if(d[2]*256+d[3] == ast->prefix) - ast->prefix_count++; - else{ - ast->prefix= d[2]*256+d[3]; - ast->prefix_count= 0; - } - - avi->stream_index= n; - ast->packet_size= size + 8; - ast->remaining= size; - - { - uint64_t pos= url_ftell(pb) - 8; - if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){ - av_add_index_entry(st, pos, ast->frame_offset / FFMAX(1, ast->sample_size), size, 0, AVINDEX_KEYFRAME); - } - } - goto resync; - } - } - /* palette changed chunk */ - if ( d[0] >= '0' && d[0] <= '9' - && d[1] >= '0' && d[1] <= '9' - && ((d[2] == 'p' && d[3] == 'c')) - && n < s->nb_streams && i + size <= avi->movi_end) { - - AVStream *st; - int first, clr, flags, k, p; - - st = s->streams[n]; - - first = get_byte(pb); - clr = get_byte(pb); - if(!clr) /* all 256 colors used */ - clr = 256; - flags = get_le16(pb); - p = 4; - for (k = first; k < clr + first; k++) { - int r, g, b; - r = get_byte(pb); - g = get_byte(pb); - b = get_byte(pb); - get_byte(pb); - st->codec->palctrl->palette[k] = b + (g << 8) + (r << 16); - } - st->codec->palctrl->palette_changed = 1; - goto resync; - } - - } - - return -1; -} - -/* XXX: we make the implicit supposition that the position are sorted - for each stream */ -static int avi_read_idx1(AVFormatContext *s, int size) -{ - AVIContext *avi = s->priv_data; - ByteIOContext *pb = &s->pb; - int nb_index_entries, i; - AVStream *st; - AVIStream *ast; - unsigned int index, tag, flags, pos, len; - unsigned last_pos= -1; - - nb_index_entries = size / 16; - if (nb_index_entries <= 0) - return -1; - - /* read the entries and sort them in each stream component */ - for(i = 0; i < nb_index_entries; i++) { - tag = get_le32(pb); - flags = get_le32(pb); - pos = get_le32(pb); - len = get_le32(pb); -#if defined(DEBUG_SEEK) - av_log(NULL, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/", - i, tag, flags, pos, len); -#endif - if(i==0 && pos > avi->movi_list) - avi->movi_list= 0; //FIXME better check - pos += avi->movi_list; - - index = ((tag & 0xff) - '0') * 10; - index += ((tag >> 8) & 0xff) - '0'; - if (index >= s->nb_streams) - continue; - st = s->streams[index]; - ast = st->priv_data; - -#if defined(DEBUG_SEEK) - av_log(NULL, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len); -#endif - if(last_pos == pos) - avi->non_interleaved= 1; - else - av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0); - if(ast->sample_size) - ast->cum_len += len; - else - ast->cum_len ++; - last_pos= pos; - } - return 0; -} - -static int guess_ni_flag(AVFormatContext *s){ - int i; - int64_t last_start=0; - int64_t first_end= INT64_MAX; - - for(i=0; i<s->nb_streams; i++){ - AVStream *st = s->streams[i]; - int n= st->nb_index_entries; - - if(n <= 0) - continue; - - if(st->index_entries[0].pos > last_start) - last_start= st->index_entries[0].pos; - if(st->index_entries[n-1].pos < first_end) - first_end= st->index_entries[n-1].pos; - } - return last_start > first_end; -} - -static int avi_load_index(AVFormatContext *s) -{ - AVIContext *avi = s->priv_data; - ByteIOContext *pb = &s->pb; - uint32_t tag, size; - offset_t pos= url_ftell(pb); - - url_fseek(pb, avi->movi_end, SEEK_SET); -#ifdef DEBUG_SEEK - printf("movi_end=0x%"PRIx64"\n", avi->movi_end); -#endif - for(;;) { - if (url_feof(pb)) - break; - tag = get_le32(pb); - size = get_le32(pb); -#ifdef DEBUG_SEEK - printf("tag=%c%c%c%c size=0x%x\n", - tag & 0xff, - (tag >> 8) & 0xff, - (tag >> 16) & 0xff, - (tag >> 24) & 0xff, - size); -#endif - switch(tag) { - case MKTAG('i', 'd', 'x', '1'): - if (avi_read_idx1(s, size) < 0) - goto skip; - else - goto the_end; - break; - default: - skip: - size += (size & 1); - url_fskip(pb, size); - break; - } - } - the_end: - url_fseek(pb, pos, SEEK_SET); - return 0; -} - -static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) -{ - AVIContext *avi = s->priv_data; - AVStream *st; - int i, index; - int64_t pos; - - if (!avi->index_loaded) { - /* we only load the index on demand */ - avi_load_index(s); - avi->index_loaded = 1; - } - assert(stream_index>= 0); - - st = s->streams[stream_index]; - index= av_index_search_timestamp(st, timestamp, flags); - if(index<0) - return -1; - - /* find the position */ - pos = st->index_entries[index].pos; - timestamp = st->index_entries[index].timestamp; - -// av_log(NULL, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp); - - if (ENABLE_DV_DEMUXER && avi->dv_demux) { - /* One and only one real stream for DV in AVI, and it has video */ - /* offsets. Calling with other stream indices should have failed */ - /* the av_index_search_timestamp call above. */ - assert(stream_index == 0); - - /* Feed the DV video stream version of the timestamp to the */ - /* DV demux so it can synth correct timestamps */ - dv_offset_reset(avi->dv_demux, timestamp); - - url_fseek(&s->pb, pos, SEEK_SET); - avi->stream_index= -1; - return 0; - } - - for(i = 0; i < s->nb_streams; i++) { - AVStream *st2 = s->streams[i]; - AVIStream *ast2 = st2->priv_data; - - ast2->packet_size= - ast2->remaining= 0; - - if (st2->nb_index_entries <= 0) - continue; - -// assert(st2->codec->block_align); - assert(st2->time_base.den == ast2->rate); - assert(st2->time_base.num == ast2->scale); - index = av_index_search_timestamp( - st2, - av_rescale(timestamp, st2->time_base.den*(int64_t)st->time_base.num, st->time_base.den * (int64_t)st2->time_base.num), - flags | AVSEEK_FLAG_BACKWARD); - if(index<0) - index=0; - - if(!avi->non_interleaved){ - while(index>0 && st2->index_entries[index].pos > pos) - index--; - while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos) - index++; - } - -// av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp); - /* extract the current frame number */ - ast2->frame_offset = st2->index_entries[index].timestamp; - if(ast2->sample_size) - ast2->frame_offset *=ast2->sample_size; - } - - /* do the seek */ - url_fseek(&s->pb, pos, SEEK_SET); - avi->stream_index= -1; - return 0; -} - -static int avi_read_close(AVFormatContext *s) -{ - int i; - AVIContext *avi = s->priv_data; - - for(i=0;i<s->nb_streams;i++) { - AVStream *st = s->streams[i]; - AVIStream *ast = st->priv_data; - av_free(ast); - av_free(st->codec->palctrl); - } - - if (avi->dv_demux) - av_free(avi->dv_demux); - - return 0; -} - -static int avi_probe(AVProbeData *p) -{ - /* check file header */ - if (p->buf_size <= 32) - return 0; - if (p->buf[0] == 'R' && p->buf[1] == 'I' && - p->buf[2] == 'F' && p->buf[3] == 'F' && - p->buf[8] == 'A' && p->buf[9] == 'V' && - p->buf[10] == 'I' && (p->buf[11] == ' ' || p->buf[11] == 0x19)) - return AVPROBE_SCORE_MAX; - else - return 0; -} - -AVInputFormat avi_demuxer = { - "avi", - "avi format", - sizeof(AVIContext), - avi_probe, - avi_read_header, - avi_read_packet, - avi_read_close, - avi_read_seek, -}; |