diff options
Diffstat (limited to 'ffmpeg/libavformat/avidec.c')
| -rw-r--r-- | ffmpeg/libavformat/avidec.c | 1614 |
1 files changed, 1614 insertions, 0 deletions
diff --git a/ffmpeg/libavformat/avidec.c b/ffmpeg/libavformat/avidec.c new file mode 100644 index 0000000..f6eb71e --- /dev/null +++ b/ffmpeg/libavformat/avidec.c @@ -0,0 +1,1614 @@ +/* + * 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 "libavutil/intreadwrite.h" +#include "libavutil/mathematics.h" +#include "libavutil/bswap.h" +#include "libavutil/opt.h" +#include "libavutil/dict.h" +#include "libavutil/avstring.h" +#include "libavutil/avassert.h" +#include "avformat.h" +#include "internal.h" +#include "avi.h" +#include "dv.h" +#include "riff.h" + +typedef struct AVIStream { + int64_t frame_offset; /* current frame (video) or byte (audio) counter + (used to compute the pts) */ + int remaining; + int packet_size; + + uint32_t scale; + uint32_t 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; + uint32_t pal[256]; + int has_pal; + int dshow_block_align; ///< block align variable used to emulate bugs in the MS dshow demuxer + + AVFormatContext *sub_ctx; + AVPacket sub_pkt; + uint8_t *sub_buffer; + + int64_t seek_pos; +} AVIStream; + +typedef struct { + const AVClass *class; + int64_t riff_end; + int64_t movi_end; + int64_t fsize; + int64_t io_fsize; + int64_t movi_list; + int64_t last_pkt_pos; + int index_loaded; + int is_odml; + int non_interleaved; + int stream_index; + DVDemuxContext* dv_demux; + int odml_depth; + int use_odml; +#define MAX_ODML_DEPTH 1000 + int64_t dts_max; +} AVIContext; + + +static const AVOption options[] = { + { "use_odml", "use odml index", offsetof(AVIContext, use_odml), AV_OPT_TYPE_INT, {.i64 = 1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM}, + { NULL }, +}; + +static const AVClass demuxer_class = { + .class_name = "avi", + .item_name = av_default_item_name, + .option = options, + .version = LIBAVUTIL_VERSION_INT, + .category = AV_CLASS_CATEGORY_DEMUXER, +}; + + +static const char avi_headers[][8] = { + { 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' }, + { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' }, + { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19}, + { 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' }, + { 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' }, + { 0 } +}; + +static const AVMetadataConv avi_metadata_conv[] = { + { "strn", "title" }, + { 0 }, +}; + +static int avi_load_index(AVFormatContext *s); +static int guess_ni_flag(AVFormatContext *s); + +#define print_tag(str, tag, size) \ + av_dlog(NULL, "%s: tag=%c%c%c%c size=0x%x\n", \ + str, tag & 0xff, \ + (tag >> 8) & 0xff, \ + (tag >> 16) & 0xff, \ + (tag >> 24) & 0xff, \ + size) + +static inline int get_duration(AVIStream *ast, int len){ + if(ast->sample_size){ + return len; + }else if (ast->dshow_block_align){ + return (len + ast->dshow_block_align - 1)/ast->dshow_block_align; + }else + return 1; +} + +static int get_riff(AVFormatContext *s, AVIOContext *pb) +{ + AVIContext *avi = s->priv_data; + char header[8]; + int i; + + /* check RIFF header */ + avio_read(pb, header, 4); + avi->riff_end = avio_rl32(pb); /* RIFF chunk size */ + avi->riff_end += avio_tell(pb); /* RIFF chunk end */ + avio_read(pb, header+4, 4); + + for(i=0; avi_headers[i][0]; i++) + if(!memcmp(header, avi_headers[i], 8)) + break; + if(!avi_headers[i][0]) + return AVERROR_INVALIDDATA; + + if(header[7] == 0x19) + av_log(s, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n"); + + return 0; +} + +static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){ + AVIContext *avi = s->priv_data; + AVIOContext *pb = s->pb; + int longs_pre_entry= avio_rl16(pb); + int index_sub_type = avio_r8(pb); + int index_type = avio_r8(pb); + int entries_in_use = avio_rl32(pb); + int chunk_id = avio_rl32(pb); + int64_t base = avio_rl64(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= avi->fsize; + + av_dlog(s, "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); + + if(stream_id >= s->nb_streams || stream_id < 0) + return AVERROR_INVALIDDATA; + st= s->streams[stream_id]; + ast = st->priv_data; + + if(index_sub_type) + return AVERROR_INVALIDDATA; + + avio_rl32(pb); + + if(index_type && longs_pre_entry != 2) + return AVERROR_INVALIDDATA; + if(index_type>1) + return AVERROR_INVALIDDATA; + + 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 AVERROR_INVALIDDATA; + } + + for(i=0; i<entries_in_use; i++){ + if(index_type){ + int64_t pos= avio_rl32(pb) + base - 8; + int len = avio_rl32(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(url_feof(pb)) + return AVERROR_INVALIDDATA; + + if(last_pos == pos || pos == base - 8) + avi->non_interleaved= 1; + if(last_pos != pos && (len || !ast->sample_size)) + av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0); + + ast->cum_len += get_duration(ast, len); + last_pos= pos; + }else{ + int64_t offset, pos; + int duration; + offset = avio_rl64(pb); + avio_rl32(pb); /* size */ + duration = avio_rl32(pb); + + if(url_feof(pb)) + return AVERROR_INVALIDDATA; + + pos = avio_tell(pb); + + if(avi->odml_depth > MAX_ODML_DEPTH){ + av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n"); + return AVERROR_INVALIDDATA; + } + + if(avio_seek(pb, offset+8, SEEK_SET) < 0) + return -1; + avi->odml_depth++; + read_braindead_odml_indx(s, frame_num); + avi->odml_depth--; + frame_num += duration; + + if(avio_seek(pb, pos, SEEK_SET) < 0) { + av_log(s, AV_LOG_ERROR, "Failed to restore position after reading index\n"); + return -1; + } + + } + } + avi->index_loaded=2; + 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, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME); + } + } +} + +static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, uint32_t size) +{ + AVIOContext *pb = s->pb; + char key[5] = {0}, *value; + + size += (size & 1); + + if (size == UINT_MAX) + return AVERROR(EINVAL); + value = av_malloc(size+1); + if (!value) + return AVERROR(ENOMEM); + avio_read(pb, value, size); + value[size]=0; + + AV_WL32(key, tag); + + return av_dict_set(st ? &st->metadata : &s->metadata, key, value, + AV_DICT_DONT_STRDUP_VAL); +} + +static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", + "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" }; + +static void avi_metadata_creation_time(AVDictionary **metadata, char *date) +{ + char month[4], time[9], buffer[64]; + int i, day, year; + /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */ + if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d", + month, &day, time, &year) == 4) { + for (i=0; i<12; i++) + if (!av_strcasecmp(month, months[i])) { + snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s", + year, i+1, day, time); + av_dict_set(metadata, "creation_time", buffer, 0); + } + } else if (date[4] == '/' && date[7] == '/') { + date[4] = date[7] = '-'; + av_dict_set(metadata, "creation_time", date, 0); + } +} + +static void avi_read_nikon(AVFormatContext *s, uint64_t end) +{ + while (avio_tell(s->pb) < end) { + uint32_t tag = avio_rl32(s->pb); + uint32_t size = avio_rl32(s->pb); + switch (tag) { + case MKTAG('n', 'c', 't', 'g'): { /* Nikon Tags */ + uint64_t tag_end = avio_tell(s->pb) + size; + while (avio_tell(s->pb) < tag_end) { + uint16_t tag = avio_rl16(s->pb); + uint16_t size = avio_rl16(s->pb); + const char *name = NULL; + char buffer[64] = {0}; + size -= avio_read(s->pb, buffer, + FFMIN(size, sizeof(buffer)-1)); + switch (tag) { + case 0x03: name = "maker"; break; + case 0x04: name = "model"; break; + case 0x13: name = "creation_time"; + if (buffer[4] == ':' && buffer[7] == ':') + buffer[4] = buffer[7] = '-'; + break; + } + if (name) + av_dict_set(&s->metadata, name, buffer, 0); + avio_skip(s->pb, size); + } + break; + } + default: + avio_skip(s->pb, size); + break; + } + } +} + +static int avi_read_header(AVFormatContext *s) +{ + AVIContext *avi = s->priv_data; + AVIOContext *pb = s->pb; + unsigned int tag, tag1, handler; + int codec_type, stream_index, frame_period; + unsigned int size; + int i; + AVStream *st; + AVIStream *ast = NULL; + int avih_width=0, avih_height=0; + int amv_file_format=0; + uint64_t list_end = 0; + int ret; + + avi->stream_index= -1; + + ret = get_riff(s, pb); + if (ret < 0) + return ret; + + av_log(avi, AV_LOG_DEBUG, "use odml:%d\n", avi->use_odml); + + avi->io_fsize = avi->fsize = avio_size(pb); + if(avi->fsize<=0 || avi->fsize < avi->riff_end) + avi->fsize= avi->riff_end == 8 ? INT64_MAX : avi->riff_end; + + /* first list tag */ + stream_index = -1; + codec_type = -1; + frame_period = 0; + for(;;) { + if (url_feof(pb)) + goto fail; + tag = avio_rl32(pb); + size = avio_rl32(pb); + + print_tag("tag", tag, size); + + switch(tag) { + case MKTAG('L', 'I', 'S', 'T'): + list_end = avio_tell(pb) + size; + /* Ignored, except at start of video packets. */ + tag1 = avio_rl32(pb); + + print_tag("list", tag1, 0); + + if (tag1 == MKTAG('m', 'o', 'v', 'i')) { + avi->movi_list = avio_tell(pb) - 4; + if(size) avi->movi_end = avi->movi_list + size + (size & 1); + else avi->movi_end = avi->fsize; + av_dlog(NULL, "movi end=%"PRIx64"\n", avi->movi_end); + goto end_of_header; + } + else if (tag1 == MKTAG('I', 'N', 'F', 'O')) + ff_read_riff_info(s, size - 4); + else if (tag1 == MKTAG('n', 'c', 'd', 't')) + avi_read_nikon(s, list_end); + + break; + case MKTAG('I', 'D', 'I', 'T'): { + unsigned char date[64] = {0}; + size += (size & 1); + size -= avio_read(pb, date, FFMIN(size, sizeof(date)-1)); + avio_skip(pb, size); + avi_metadata_creation_time(&s->metadata, date); + break; + } + case MKTAG('d', 'm', 'l', 'h'): + avi->is_odml = 1; + avio_skip(pb, size + (size & 1)); + break; + case MKTAG('a', 'm', 'v', 'h'): + amv_file_format=1; + case MKTAG('a', 'v', 'i', 'h'): + /* AVI header */ + /* using frame_period is bad idea */ + frame_period = avio_rl32(pb); + avio_rl32(pb); /* max. bytes per second */ + avio_rl32(pb); + avi->non_interleaved |= avio_rl32(pb) & AVIF_MUSTUSEINDEX; + + avio_skip(pb, 2 * 4); + avio_rl32(pb); + avio_rl32(pb); + avih_width=avio_rl32(pb); + avih_height=avio_rl32(pb); + + avio_skip(pb, size - 10 * 4); + break; + case MKTAG('s', 't', 'r', 'h'): + /* stream header */ + + tag1 = avio_rl32(pb); + handler = avio_rl32(pb); /* codec tag */ + + if(tag1 == MKTAG('p', 'a', 'd', 's')){ + avio_skip(pb, size - 8); + break; + }else{ + stream_index++; + st = avformat_new_stream(s, NULL); + if (!st) + goto fail; + + st->id = stream_index; + ast = av_mallocz(sizeof(AVIStream)); + if (!ast) + goto fail; + st->priv_data = ast; + } + if(amv_file_format) + tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s'); + + print_tag("strh", tag1, -1); + + 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 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]->codec); + if (s->streams[0]->info) + av_freep(&s->streams[0]->info->duration_error); + av_freep(&s->streams[0]->info); + av_freep(&s->streams[0]); + s->nb_streams = 0; + if (CONFIG_DV_DEMUXER) { + avi->dv_demux = avpriv_dv_init_demux(s); + if (!avi->dv_demux) + goto fail; + } + s->streams[0]->priv_data = ast; + avio_skip(pb, 3 * 4); + ast->scale = avio_rl32(pb); + ast->rate = avio_rl32(pb); + avio_skip(pb, 4); /* start time */ + + dv_dur = avio_rl32(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 bitrate. + */ + + stream_index = s->nb_streams - 1; + avio_skip(pb, size - 9*4); + break; + } + + av_assert0(stream_index < s->nb_streams); + st->codec->stream_codec_tag= handler; + + avio_rl32(pb); /* flags */ + avio_rl16(pb); /* priority */ + avio_rl16(pb); /* language */ + avio_rl32(pb); /* initial frame */ + ast->scale = avio_rl32(pb); + ast->rate = avio_rl32(pb); + if(!(ast->scale && ast->rate)){ + av_log(s, AV_LOG_WARNING, "scale/rate is %u/%u which is invalid. (This file has been generated by broken software.)\n", ast->scale, ast->rate); + if(frame_period){ + ast->rate = 1000000; + ast->scale = frame_period; + }else{ + ast->rate = 25; + ast->scale = 1; + } + } + avpriv_set_pts_info(st, 64, ast->scale, ast->rate); + + ast->cum_len=avio_rl32(pb); /* start */ + st->nb_frames = avio_rl32(pb); + + st->start_time = 0; + avio_rl32(pb); /* buffer size */ + avio_rl32(pb); /* quality */ + if (ast->cum_len*ast->scale/ast->rate > 3600) { + av_log(s, AV_LOG_ERROR, "crazy start time, iam scared, giving up\n"); + return AVERROR_INVALIDDATA; + } + ast->sample_size = avio_rl32(pb); /* sample ssize */ + ast->cum_len *= FFMAX(1, ast->sample_size); + av_dlog(s, "%"PRIu32" %"PRIu32" %d\n", + ast->rate, ast->scale, ast->sample_size); + + switch(tag1) { + case MKTAG('v', 'i', 'd', 's'): + codec_type = AVMEDIA_TYPE_VIDEO; + + ast->sample_size = 0; + break; + case MKTAG('a', 'u', 'd', 's'): + codec_type = AVMEDIA_TYPE_AUDIO; + break; + case MKTAG('t', 'x', 't', 's'): + codec_type = AVMEDIA_TYPE_SUBTITLE; + break; + case MKTAG('d', 'a', 't', 's'): + codec_type = AVMEDIA_TYPE_DATA; + break; + default: + av_log(s, AV_LOG_INFO, "unknown stream type %X\n", tag1); + } + if(ast->sample_size == 0) { + st->duration = st->nb_frames; + if (st->duration > 0 && avi->io_fsize > 0 && avi->riff_end > avi->io_fsize) { + av_log(s, AV_LOG_DEBUG, "File is truncated adjusting duration\n"); + st->duration = av_rescale(st->duration, avi->io_fsize, avi->riff_end); + } + } + ast->frame_offset= ast->cum_len; + avio_skip(pb, size - 12 * 4); + break; + case MKTAG('s', 't', 'r', 'f'): + /* stream header */ + if (!size) + break; + if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) { + avio_skip(pb, size); + } else { + uint64_t cur_pos = avio_tell(pb); + unsigned esize; + if (cur_pos < list_end) + size = FFMIN(size, list_end - cur_pos); + st = s->streams[stream_index]; + switch(codec_type) { + case AVMEDIA_TYPE_VIDEO: + if(amv_file_format){ + st->codec->width=avih_width; + st->codec->height=avih_height; + st->codec->codec_type = AVMEDIA_TYPE_VIDEO; + st->codec->codec_id = AV_CODEC_ID_AMV; + avio_skip(pb, size); + break; + } + tag1 = ff_get_bmp_header(pb, st, &esize); + + if (tag1 == MKTAG('D', 'X', 'S', 'B') || tag1 == MKTAG('D','X','S','A')) { + st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; + st->codec->codec_tag = tag1; + st->codec->codec_id = AV_CODEC_ID_XSUB; + break; + } + + if(size > 10*4 && size<(1<<30) && size < avi->fsize){ + if(esize == size-1 && (esize&1)) st->codec->extradata_size= esize - 10*4; + else st->codec->extradata_size= size - 10*4; + st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE); + if (!st->codec->extradata) { + st->codec->extradata_size= 0; + return AVERROR(ENOMEM); + } + avio_read(pb, st->codec->extradata, st->codec->extradata_size); + } + + if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly + avio_r8(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_coded_sample <= 8)) { + int pal_size = (1 << st->codec->bits_per_coded_sample) << 2; + const uint8_t *pal_src; + + pal_size = FFMIN(pal_size, st->codec->extradata_size); + pal_src = st->codec->extradata + st->codec->extradata_size - pal_size; + for (i = 0; i < pal_size/4; i++) + ast->pal[i] = 0xFFU<<24 | AV_RL32(pal_src+4*i); + ast->has_pal = 1; + } + + print_tag("video", tag1, 0); + + st->codec->codec_type = AVMEDIA_TYPE_VIDEO; + st->codec->codec_tag = tag1; + st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1); + st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts. + + if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){ + st->codec->extradata_size+= 9; + st->codec->extradata= av_realloc_f(st->codec->extradata, 1, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE); + if(st->codec->extradata) + memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9); + } + st->codec->height= FFABS(st->codec->height); + +// avio_skip(pb, size - 5 * 4); + break; + case AVMEDIA_TYPE_AUDIO: + ret = ff_get_wav_header(pb, st->codec, size); + if (ret < 0) + return ret; + ast->dshow_block_align= st->codec->block_align; + if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){ + av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align); + ast->sample_size= st->codec->block_align; + } + if (size&1) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */ + avio_skip(pb, 1); + /* Force parsing as several audio frames can be in + * one packet and timestamps refer to packet start. */ + st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS; + /* 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 == AV_CODEC_ID_AAC && st->codec->extradata_size) + st->need_parsing = AVSTREAM_PARSE_NONE; + /* 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 == AV_RL32("Axan")){ + st->codec->codec_id = AV_CODEC_ID_XAN_DPCM; + st->codec->codec_tag = 0; + ast->dshow_block_align = 0; + } + if (amv_file_format){ + st->codec->codec_id = AV_CODEC_ID_ADPCM_IMA_AMV; + ast->dshow_block_align = 0; + } + if(st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align <= 4 && ast->dshow_block_align) { + av_log(s, AV_LOG_DEBUG, "overriding invalid dshow_block_align of %d\n", ast->dshow_block_align); + ast->dshow_block_align = 0; + } + if(st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 1024 && ast->sample_size == 1024 || + st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 4096 && ast->sample_size == 4096 || + st->codec->codec_id == AV_CODEC_ID_MP3 && ast->dshow_block_align == 1152 && ast->sample_size == 1152) { + av_log(s, AV_LOG_DEBUG, "overriding sample_size\n"); + ast->sample_size = 0; + } + break; + case AVMEDIA_TYPE_SUBTITLE: + st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; + st->request_probe= 1; + avio_skip(pb, size); + break; + default: + st->codec->codec_type = AVMEDIA_TYPE_DATA; + st->codec->codec_id= AV_CODEC_ID_NONE; + st->codec->codec_tag= 0; + avio_skip(pb, size); + break; + } + } + break; + case MKTAG('s', 't', 'r', 'd'): + if (stream_index >= (unsigned)s->nb_streams || s->streams[stream_index]->codec->extradata_size) { + avio_skip(pb, size); + } else { + uint64_t cur_pos = avio_tell(pb); + if (cur_pos < list_end) + size = FFMIN(size, list_end - cur_pos); + st = s->streams[stream_index]; + + if(size<(1<<30)){ + st->codec->extradata_size= size; + st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE); + if (!st->codec->extradata) { + st->codec->extradata_size= 0; + return AVERROR(ENOMEM); + } + avio_read(pb, st->codec->extradata, st->codec->extradata_size); + } + + if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly + avio_r8(pb); + } + break; + case MKTAG('i', 'n', 'd', 'x'): + i= avio_tell(pb); + if(pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) && avi->use_odml && + read_braindead_odml_indx(s, 0) < 0 && (s->error_recognition & AV_EF_EXPLODE)) + goto fail; + avio_seek(pb, i+size, SEEK_SET); + break; + case MKTAG('v', 'p', 'r', 'p'): + if(stream_index < (unsigned)s->nb_streams && size > 9*4){ + AVRational active, active_aspect; + + st = s->streams[stream_index]; + avio_rl32(pb); + avio_rl32(pb); + avio_rl32(pb); + avio_rl32(pb); + avio_rl32(pb); + + active_aspect.den= avio_rl16(pb); + active_aspect.num= avio_rl16(pb); + active.num = avio_rl32(pb); + active.den = avio_rl32(pb); + avio_rl32(pb); //nbFieldsPerFrame + + if(active_aspect.num && active_aspect.den && active.num && active.den){ + st->sample_aspect_ratio= av_div_q(active_aspect, active); + av_dlog(s, "vprp %d/%d %d/%d\n", + active_aspect.num, active_aspect.den, + active.num, active.den); + } + size -= 9*4; + } + avio_skip(pb, size); + break; + case MKTAG('s', 't', 'r', 'n'): + if(s->nb_streams){ + ret = avi_read_tag(s, s->streams[s->nb_streams-1], tag, size); + if (ret < 0) + return ret; + break; + } + default: + if(size > 1000000){ + av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, " + "I will ignore it and try to continue anyway.\n"); + if (s->error_recognition & AV_EF_EXPLODE) + goto fail; + avi->movi_list = avio_tell(pb) - 4; + avi->movi_end = avi->fsize; + goto end_of_header; + } + /* skip tag */ + size += (size & 1); + avio_skip(pb, size); + break; + } + } + end_of_header: + /* check stream number */ + if (stream_index != s->nb_streams - 1) { + fail: + return AVERROR_INVALIDDATA; + } + + if(!avi->index_loaded && pb->seekable) + avi_load_index(s); + avi->index_loaded |= 1; + avi->non_interleaved |= guess_ni_flag(s) | (s->flags & AVFMT_FLAG_SORT_DTS); + for(i=0; i<s->nb_streams; i++){ + AVStream *st = s->streams[i]; + if(st->nb_index_entries) + break; + } + // DV-in-AVI cannot be non-interleaved, if set this must be + // a mis-detection. + if(avi->dv_demux) + avi->non_interleaved=0; + if(i==s->nb_streams && avi->non_interleaved) { + av_log(s, AV_LOG_WARNING, "non-interleaved AVI without index, switching to interleaved\n"); + avi->non_interleaved=0; + } + + if(avi->non_interleaved) { + av_log(s, AV_LOG_INFO, "non-interleaved AVI\n"); + clean_index(s); + } + + ff_metadata_conv_ctx(s, NULL, avi_metadata_conv); + ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv); + + return 0; +} + +static int read_gab2_sub(AVStream *st, AVPacket *pkt) { + if (pkt->data && !strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data+5) == 2) { + uint8_t desc[256]; + int score = AVPROBE_SCORE_MAX / 2, ret; + AVIStream *ast = st->priv_data; + AVInputFormat *sub_demuxer; + AVRational time_base; + AVIOContext *pb = avio_alloc_context( pkt->data + 7, + pkt->size - 7, + 0, NULL, NULL, NULL, NULL); + AVProbeData pd; + unsigned int desc_len = avio_rl32(pb); + + if (desc_len > pb->buf_end - pb->buf_ptr) + goto error; + + ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc)); + avio_skip(pb, desc_len - ret); + if (*desc) + av_dict_set(&st->metadata, "title", desc, 0); + + avio_rl16(pb); /* flags? */ + avio_rl32(pb); /* data size */ + + pd = (AVProbeData) { .buf = pb->buf_ptr, .buf_size = pb->buf_end - pb->buf_ptr }; + if (!(sub_demuxer = av_probe_input_format2(&pd, 1, &score))) + goto error; + + if (!(ast->sub_ctx = avformat_alloc_context())) + goto error; + + ast->sub_ctx->pb = pb; + if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) { + ff_read_packet(ast->sub_ctx, &ast->sub_pkt); + *st->codec = *ast->sub_ctx->streams[0]->codec; + ast->sub_ctx->streams[0]->codec->extradata = NULL; + time_base = ast->sub_ctx->streams[0]->time_base; + avpriv_set_pts_info(st, 64, time_base.num, time_base.den); + } + ast->sub_buffer = pkt->data; + memset(pkt, 0, sizeof(*pkt)); + return 1; +error: + av_freep(&pb); + } + return 0; +} + +static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st, + AVPacket *pkt) +{ + AVIStream *ast, *next_ast = next_st->priv_data; + int64_t ts, next_ts, ts_min = INT64_MAX; + AVStream *st, *sub_st = NULL; + int i; + + next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base, + AV_TIME_BASE_Q); + + for (i=0; i<s->nb_streams; i++) { + st = s->streams[i]; + ast = st->priv_data; + if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) { + ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q); + if (ts <= next_ts && ts < ts_min) { + ts_min = ts; + sub_st = st; + } + } + } + + if (sub_st) { + ast = sub_st->priv_data; + *pkt = ast->sub_pkt; + pkt->stream_index = sub_st->index; + if (ff_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0) + ast->sub_pkt.data = NULL; + } + return sub_st; +} + +static int get_stream_idx(int *d){ + if( d[0] >= '0' && d[0] <= '9' + && d[1] >= '0' && d[1] <= '9'){ + return (d[0] - '0') * 10 + (d[1] - '0'); + }else{ + return 100; //invalid stream ID + } +} + +/** + * + * @param exit_early set to 1 to just gather packet position without making the changes needed to actually read & return the packet + */ +static int avi_sync(AVFormatContext *s, int exit_early) +{ + AVIContext *avi = s->priv_data; + AVIOContext *pb = s->pb; + int n; + unsigned int d[8]; + unsigned int size; + int64_t i, sync; + +start_sync: + memset(d, -1, sizeof(d)); + for(i=sync=avio_tell(pb); !url_feof(pb); i++) { + int j; + + for(j=0; j<7; j++) + d[j]= d[j+1]; + d[7]= avio_r8(pb); + + size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24); + + n= get_stream_idx(d+2); + av_dlog(s, "%X %X %X %X %X %X %X %X %"PRId64" %u %d\n", + d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n); + if(i + (uint64_t)size > avi->fsize || d[0] > 127) + 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') + ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){ + avio_skip(pb, size); + goto start_sync; + } + + //parse stray LIST + if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){ + avio_skip(pb, 4); + goto start_sync; + } + + n= get_stream_idx(d); + + if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams) + continue; + + //detect ##ix chunk and skip + if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){ + avio_skip(pb, size); + goto start_sync; + } + + //parse ##dc/##wb + if(n < s->nb_streams){ + AVStream *st; + AVIStream *ast; + st = s->streams[n]; + ast = st->priv_data; + + if (!ast) { + av_log(s, AV_LOG_WARNING, "Skiping foreign stream %d packet\n", n); + continue; + } + + if(s->nb_streams>=2){ + AVStream *st1 = s->streams[1]; + AVIStream *ast1= st1->priv_data; + //workaround for broken small-file-bug402.avi + if( d[2] == 'w' && d[3] == 'b' + && n==0 + && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO + && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO + && ast->prefix == 'd'*256+'c' + && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count) + ){ + n=1; + st = st1; + ast = ast1; + av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n"); + } + } + + + if( (st->discard >= AVDISCARD_DEFAULT && size==0) + /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & AV_PKT_FLAG_KEY))*/ //FIXME needs a little reordering + || st->discard >= AVDISCARD_ALL){ + if (!exit_early) { + ast->frame_offset += get_duration(ast, size); + } + avio_skip(pb, size); + goto start_sync; + } + + if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) { + int k = avio_r8(pb); + int last = (k + avio_r8(pb) - 1) & 0xFF; + + avio_rl16(pb); //flags + + for (; k <= last; k++) + ast->pal[k] = 0xFFU<<24 | avio_rb32(pb)>>8;// b + (g << 8) + (r << 16); + ast->has_pal= 1; + goto start_sync; + } else 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')*/) { + + if (exit_early) + return 0; + 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; + + if(size || !ast->sample_size){ + uint64_t pos= avio_tell(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, size, 0, AVINDEX_KEYFRAME); + } + } + return 0; + } + } + } + + if(pb->error) + return pb->error; + return AVERROR_EOF; +} + +static int avi_read_packet(AVFormatContext *s, AVPacket *pkt) +{ + AVIContext *avi = s->priv_data; + AVIOContext *pb = s->pb; + int err; +#if FF_API_DESTRUCT_PACKET + void* dstr; +#endif + + if (CONFIG_DV_DEMUXER && avi->dv_demux) { + int size = avpriv_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; + int64_t last_ts; + + if(!st->nb_index_entries) + continue; + + last_ts = st->index_entries[st->nb_index_entries - 1].timestamp; + if(!ast->remaining && ts > last_ts) + continue; + + ts = av_rescale_q(ts, st->time_base, (AVRational){FFMAX(1, ast->sample_size), AV_TIME_BASE}); + + av_dlog(s, "%"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; + } + } + if(!best_st) + return AVERROR_EOF; + + best_ast = best_st->priv_data; + best_ts = best_ast->frame_offset; + 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); + if(i>=0) + best_ast->frame_offset= best_st->index_entries[i].timestamp; + } + + if(i>=0){ + int64_t pos= best_st->index_entries[i].pos; + pos += best_ast->packet_size - best_ast->remaining; + if(avio_seek(s->pb, pos + 8, SEEK_SET) < 0) + return AVERROR_EOF; + + av_assert0(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; + } + else + return AVERROR_EOF; + } + +resync: + if(avi->stream_index >= 0){ + AVStream *st= s->streams[ avi->stream_index ]; + AVIStream *ast= st->priv_data; + int size, err; + + if(get_subtitle_pkt(s, st, pkt)) + return 0; + + if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM + size= INT_MAX; + else if(ast->sample_size < 32) + // arbitrary multiplier to avoid tiny packets for raw PCM data + size= 1024*ast->sample_size; + else + size= ast->sample_size; + + if(size > ast->remaining) + size= ast->remaining; + avi->last_pkt_pos= avio_tell(pb); + err= av_get_packet(pb, pkt, size); + if(err<0) + return err; + size = err; + + if(ast->has_pal && pkt->size<(unsigned)INT_MAX/2){ + uint8_t *pal; + pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE); + if(!pal){ + av_log(s, AV_LOG_ERROR, "Failed to allocate data for palette\n"); + }else{ + memcpy(pal, ast->pal, AVPALETTE_SIZE); + ast->has_pal = 0; + } + } + + if (CONFIG_DV_DEMUXER && avi->dv_demux) { + AVBufferRef *avbuf = pkt->buf; +#if FF_API_DESTRUCT_PACKET + dstr = pkt->destruct; +#endif + size = avpriv_dv_produce_packet(avi->dv_demux, pkt, + pkt->data, pkt->size, pkt->pos); +#if FF_API_DESTRUCT_PACKET + pkt->destruct = dstr; +#endif + pkt->buf = avbuf; + pkt->flags |= AV_PKT_FLAG_KEY; + if (size < 0) + av_free_packet(pkt); + } else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE + && !st->codec->codec_tag && read_gab2_sub(st, pkt)) { + ast->frame_offset++; + avi->stream_index = -1; + ast->remaining = 0; + goto resync; + } 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_dlog(s, "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 == AVMEDIA_TYPE_VIDEO) { + AVIndexEntry *e; + int index; + av_assert0(st->index_entries); + + index= av_index_search_timestamp(st, ast->frame_offset, 0); + e= &st->index_entries[index]; + + if(index >= 0 && e->timestamp == ast->frame_offset){ + if (index == st->nb_index_entries-1){ + int key=1; + int i; + uint32_t state=-1; + for(i=0; i<FFMIN(size,256); i++){ + if(st->codec->codec_id == AV_CODEC_ID_MPEG4){ + if(state == 0x1B6){ + key= !(pkt->data[i]&0xC0); + break; + } + }else + break; + state= (state<<8) + pkt->data[i]; + } + if(!key) + e->flags &= ~AVINDEX_KEYFRAME; + } + if (e->flags & AVINDEX_KEYFRAME) + pkt->flags |= AV_PKT_FLAG_KEY; + } + } else { + pkt->flags |= AV_PKT_FLAG_KEY; + } + ast->frame_offset += get_duration(ast, pkt->size); + } + ast->remaining -= err; + if(!ast->remaining){ + avi->stream_index= -1; + ast->packet_size= 0; + } + + if(!avi->non_interleaved && pkt->pos >= 0 && ast->seek_pos > pkt->pos){ + av_free_packet(pkt); + goto resync; + } + ast->seek_pos= 0; + + if(!avi->non_interleaved && st->nb_index_entries>1 && avi->index_loaded>1){ + int64_t dts= av_rescale_q(pkt->dts, st->time_base, AV_TIME_BASE_Q); + + if(avi->dts_max - dts > 2*AV_TIME_BASE){ + avi->non_interleaved= 1; + av_log(s, AV_LOG_INFO, "Switching to NI mode, due to poor interleaving\n"); + }else if(avi->dts_max < dts) + avi->dts_max = dts; + } + + return 0; + } + + if ((err = avi_sync(s, 0)) < 0) + return err; + goto resync; +} + +/* XXX: We make the implicit supposition that the positions are sorted + for each stream. */ +static int avi_read_idx1(AVFormatContext *s, int size) +{ + AVIContext *avi = s->priv_data; + AVIOContext *pb = s->pb; + int nb_index_entries, i; + AVStream *st; + AVIStream *ast; + unsigned int index, tag, flags, pos, len, first_packet = 1; + unsigned last_pos= -1; + unsigned last_idx= -1; + int64_t idx1_pos, first_packet_pos = 0, data_offset = 0; + int anykey = 0; + + nb_index_entries = size / 16; + if (nb_index_entries <= 0) + return AVERROR_INVALIDDATA; + + idx1_pos = avio_tell(pb); + avio_seek(pb, avi->movi_list+4, SEEK_SET); + if (avi_sync(s, 1) == 0) { + first_packet_pos = avio_tell(pb) - 8; + } + avi->stream_index = -1; + avio_seek(pb, idx1_pos, SEEK_SET); + + if (s->nb_streams == 1 && s->streams[0]->codec->codec_tag == AV_RL32("MMES")){ + first_packet_pos = 0; + data_offset = avi->movi_list; + } + + /* Read the entries and sort them in each stream component. */ + for(i = 0; i < nb_index_entries; i++) { + if(url_feof(pb)) + return -1; + + tag = avio_rl32(pb); + flags = avio_rl32(pb); + pos = avio_rl32(pb); + len = avio_rl32(pb); + av_dlog(s, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/", + i, tag, flags, pos, len); + + 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(first_packet && first_packet_pos && len) { + data_offset = first_packet_pos - pos; + first_packet = 0; + } + pos += data_offset; + + av_dlog(s, "%d cum_len=%"PRId64"\n", len, ast->cum_len); + + // even if we have only a single stream, we should + // switch to non-interleaved to get correct timestamps + if(last_pos == pos) + avi->non_interleaved= 1; + if(last_idx != pos && len) { + av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0); + last_idx= pos; + } + ast->cum_len += get_duration(ast, len); + last_pos= pos; + anykey |= flags&AVIIF_INDEX; + } + if (!anykey) { + for (index = 0; index < s->nb_streams; index++) { + st = s->streams[index]; + if (st->nb_index_entries) + st->index_entries[0].flags |= AVINDEX_KEYFRAME; + } + } + return 0; +} + +static int guess_ni_flag(AVFormatContext *s){ + int i; + int64_t last_start=0; + int64_t first_end= INT64_MAX; + int64_t oldpos= avio_tell(s->pb); + int *idx; + int64_t min_pos, pos; + + for(i=0; i<s->nb_streams; i++){ + AVStream *st = s->streams[i]; + int n= st->nb_index_entries; + unsigned int size; + + if(n <= 0) + continue; + + if(n >= 2){ + int64_t pos= st->index_entries[0].pos; + avio_seek(s->pb, pos + 4, SEEK_SET); + size= avio_rl32(s->pb); + if(pos + size > st->index_entries[1].pos) + last_start= INT64_MAX; + } + + 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; + } + avio_seek(s->pb, oldpos, SEEK_SET); + if (last_start > first_end) + return 1; + idx= av_mallocz(sizeof(*idx) * s->nb_streams); + for (min_pos=pos=0; min_pos!=INT64_MAX; pos= min_pos+1LU) { + int64_t max_dts = INT64_MIN/2, min_dts= INT64_MAX/2; + min_pos = INT64_MAX; + + for (i=0; i<s->nb_streams; i++) { + AVStream *st = s->streams[i]; + int n= st->nb_index_entries; + while (idx[i]<n && st->index_entries[idx[i]].pos < pos) + idx[i]++; + if (idx[i] < n) { + min_dts = FFMIN(min_dts, av_rescale_q(st->index_entries[idx[i]].timestamp, st->time_base, AV_TIME_BASE_Q)); + min_pos = FFMIN(min_pos, st->index_entries[idx[i]].pos); + } + if (idx[i]) + max_dts = FFMAX(max_dts, av_rescale_q(st->index_entries[idx[i]-1].timestamp, st->time_base, AV_TIME_BASE_Q)); + } + if(max_dts - min_dts > 2*AV_TIME_BASE) { + av_free(idx); + return 1; + } + } + av_free(idx); + return 0; +} + +static int avi_load_index(AVFormatContext *s) +{ + AVIContext *avi = s->priv_data; + AVIOContext *pb = s->pb; + uint32_t tag, size; + int64_t pos= avio_tell(pb); + int64_t next; + int ret = -1; + + if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0) + goto the_end; // maybe truncated file + av_dlog(s, "movi_end=0x%"PRIx64"\n", avi->movi_end); + for(;;) { + tag = avio_rl32(pb); + size = avio_rl32(pb); + if (url_feof(pb)) + break; + next = avio_tell(pb) + size + (size & 1); + + av_dlog(s, "tag=%c%c%c%c size=0x%x\n", + tag & 0xff, + (tag >> 8) & 0xff, + (tag >> 16) & 0xff, + (tag >> 24) & 0xff, + size); + + if (tag == MKTAG('i', 'd', 'x', '1') && + avi_read_idx1(s, size) >= 0) { + avi->index_loaded=2; + ret = 0; + }else if(tag == MKTAG('L', 'I', 'S', 'T')) { + uint32_t tag1 = avio_rl32(pb); + + if (tag1 == MKTAG('I', 'N', 'F', 'O')) + ff_read_riff_info(s, size - 4); + }else if(!ret) + break; + + if (avio_seek(pb, next, SEEK_SET) < 0) + break; // something is wrong here + } + the_end: + avio_seek(pb, pos, SEEK_SET); + return ret; +} + +static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp) +{ + AVIStream *ast2 = st2->priv_data; + int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base); + av_free_packet(&ast2->sub_pkt); + if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 || + avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0) + ff_read_packet(ast2->sub_ctx, &ast2->sub_pkt); +} + +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, pos_min; + AVIStream *ast; + + if (!avi->index_loaded) { + /* we only load the index on demand */ + avi_load_index(s); + avi->index_loaded |= 1; + } + av_assert0(stream_index>= 0); + + st = s->streams[stream_index]; + ast= st->priv_data; + index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags); + if (index<0) { + if (st->nb_index_entries > 0) + av_log(s, AV_LOG_DEBUG, "Failed to find timestamp %"PRId64 " in index %"PRId64 " .. %"PRId64 "\n", + timestamp * FFMAX(ast->sample_size, 1), + st->index_entries[0].timestamp, + st->index_entries[st->nb_index_entries - 1].timestamp); + return AVERROR_INVALIDDATA; + } + + /* find the position */ + pos = st->index_entries[index].pos; + timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1); + + av_dlog(s, "XX %"PRId64" %d %"PRId64"\n", + timestamp, index, st->index_entries[index].timestamp); + + if (CONFIG_DV_DEMUXER && avi->dv_demux) { + /* One and only one real stream for DV in AVI, and it has video */ + /* offsets. Calling with other stream indexes should have failed */ + /* the av_index_search_timestamp call above. */ + av_assert0(stream_index == 0); + + if(avio_seek(s->pb, pos, SEEK_SET) < 0) + return -1; + + /* Feed the DV video stream version of the timestamp to the */ + /* DV demux so it can synthesize correct timestamps. */ + ff_dv_offset_reset(avi->dv_demux, timestamp); + + avi->stream_index= -1; + return 0; + } + + pos_min= pos; + 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 (ast2->sub_ctx) { + seek_subtitle(st, st2, timestamp); + continue; + } + + if (st2->nb_index_entries <= 0) + continue; + +// av_assert1(st2->codec->block_align); + av_assert0((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale); + index = av_index_search_timestamp( + st2, + av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1), + flags | AVSEEK_FLAG_BACKWARD | (st2->codec->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0)); + if(index<0) + index=0; + ast2->seek_pos= st2->index_entries[index].pos; + pos_min= FFMIN(pos_min,ast2->seek_pos); + } + for(i = 0; i < s->nb_streams; i++) { + AVStream *st2 = s->streams[i]; + AVIStream *ast2 = st2->priv_data; + + if (ast2->sub_ctx || st2->nb_index_entries <= 0) + continue; + + index = av_index_search_timestamp( + st2, + av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1), + flags | AVSEEK_FLAG_BACKWARD | (st2->codec->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0)); + if(index<0) + index=0; + while(!avi->non_interleaved && index>0 && st2->index_entries[index-1].pos >= pos_min) + index--; + ast2->frame_offset = st2->index_entries[index].timestamp; + } + + /* do the seek */ + if (avio_seek(s->pb, pos_min, SEEK_SET) < 0) { + av_log(s, AV_LOG_ERROR, "Seek failed\n"); + return -1; + } + avi->stream_index= -1; + avi->dts_max= INT_MIN; + 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; + if (ast) { + if (ast->sub_ctx) { + av_freep(&ast->sub_ctx->pb); + avformat_close_input(&ast->sub_ctx); + } + av_free(ast->sub_buffer); + av_free_packet(&ast->sub_pkt); + } + } + + av_free(avi->dv_demux); + + return 0; +} + +static int avi_probe(AVProbeData *p) +{ + int i; + + /* check file header */ + for(i=0; avi_headers[i][0]; i++) + if(!memcmp(p->buf , avi_headers[i] , 4) && + !memcmp(p->buf+8, avi_headers[i]+4, 4)) + return AVPROBE_SCORE_MAX; + + return 0; +} + +AVInputFormat ff_avi_demuxer = { + .name = "avi", + .long_name = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"), + .priv_data_size = sizeof(AVIContext), + .read_probe = avi_probe, + .read_header = avi_read_header, + .read_packet = avi_read_packet, + .read_close = avi_read_close, + .read_seek = avi_read_seek, + .priv_class = &demuxer_class, +}; |