diff options
Diffstat (limited to 'ffmpeg1/libavformat/flvdec.c')
| -rw-r--r-- | ffmpeg1/libavformat/flvdec.c | 923 |
1 files changed, 923 insertions, 0 deletions
diff --git a/ffmpeg1/libavformat/flvdec.c b/ffmpeg1/libavformat/flvdec.c new file mode 100644 index 0000000..d0511f1 --- /dev/null +++ b/ffmpeg1/libavformat/flvdec.c @@ -0,0 +1,923 @@ +/* + * FLV demuxer + * Copyright (c) 2003 The FFmpeg Project + * + * This demuxer will generate a 1 byte extradata for VP6F content. + * It is composed of: + * - upper 4bits: difference between encoded width and visible width + * - lower 4bits: difference between encoded height and visible height + * + * 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/avstring.h" +#include "libavutil/channel_layout.h" +#include "libavutil/dict.h" +#include "libavutil/opt.h" +#include "libavutil/intfloat.h" +#include "libavutil/mathematics.h" +#include "libavcodec/bytestream.h" +#include "libavcodec/mpeg4audio.h" +#include "avformat.h" +#include "internal.h" +#include "avio_internal.h" +#include "flv.h" + +#define VALIDATE_INDEX_TS_THRESH 2500 + +typedef struct { + const AVClass *class; ///< Class for private options. + int trust_metadata; ///< configure streams according onMetaData + int wrong_dts; ///< wrong dts due to negative cts + uint8_t *new_extradata[FLV_STREAM_TYPE_NB]; + int new_extradata_size[FLV_STREAM_TYPE_NB]; + int last_sample_rate; + int last_channels; + struct { + int64_t dts; + int64_t pos; + } validate_index[2]; + int validate_next; + int validate_count; + int searched_for_end; +} FLVContext; + +static int flv_probe(AVProbeData *p) +{ + const uint8_t *d; + + d = p->buf; + if (d[0] == 'F' && d[1] == 'L' && d[2] == 'V' && d[3] < 5 && d[5]==0 && AV_RB32(d+5)>8) { + return AVPROBE_SCORE_MAX; + } + return 0; +} + +static AVStream *create_stream(AVFormatContext *s, int codec_type) +{ + AVStream *st = avformat_new_stream(s, NULL); + if (!st) + return NULL; + st->codec->codec_type = codec_type; + if(s->nb_streams>=3 ||( s->nb_streams==2 + && s->streams[0]->codec->codec_type != AVMEDIA_TYPE_DATA + && s->streams[1]->codec->codec_type != AVMEDIA_TYPE_DATA)) + s->ctx_flags &= ~AVFMTCTX_NOHEADER; + + avpriv_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */ + return st; +} +static int flv_same_audio_codec(AVCodecContext *acodec, int flags) +{ + int bits_per_coded_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8; + int flv_codecid = flags & FLV_AUDIO_CODECID_MASK; + int codec_id; + + if (!acodec->codec_id && !acodec->codec_tag) + return 1; + + if (acodec->bits_per_coded_sample != bits_per_coded_sample) + return 0; + + switch(flv_codecid) { + //no distinction between S16 and S8 PCM codec flags + case FLV_CODECID_PCM: + codec_id = bits_per_coded_sample == 8 ? AV_CODEC_ID_PCM_U8 : +#if HAVE_BIGENDIAN + AV_CODEC_ID_PCM_S16BE; +#else + AV_CODEC_ID_PCM_S16LE; +#endif + return codec_id == acodec->codec_id; + case FLV_CODECID_PCM_LE: + codec_id = bits_per_coded_sample == 8 ? AV_CODEC_ID_PCM_U8 : AV_CODEC_ID_PCM_S16LE; + return codec_id == acodec->codec_id; + case FLV_CODECID_AAC: + return acodec->codec_id == AV_CODEC_ID_AAC; + case FLV_CODECID_ADPCM: + return acodec->codec_id == AV_CODEC_ID_ADPCM_SWF; + case FLV_CODECID_SPEEX: + return acodec->codec_id == AV_CODEC_ID_SPEEX; + case FLV_CODECID_MP3: + return acodec->codec_id == AV_CODEC_ID_MP3; + case FLV_CODECID_NELLYMOSER_8KHZ_MONO: + case FLV_CODECID_NELLYMOSER_16KHZ_MONO: + case FLV_CODECID_NELLYMOSER: + return acodec->codec_id == AV_CODEC_ID_NELLYMOSER; + case FLV_CODECID_PCM_MULAW: + return acodec->sample_rate == 8000 && + acodec->codec_id == AV_CODEC_ID_PCM_MULAW; + case FLV_CODECID_PCM_ALAW: + return acodec->sample_rate = 8000 && + acodec->codec_id == AV_CODEC_ID_PCM_ALAW; + default: + return acodec->codec_tag == (flv_codecid >> FLV_AUDIO_CODECID_OFFSET); + } +} + +static void flv_set_audio_codec(AVFormatContext *s, AVStream *astream, AVCodecContext *acodec, int flv_codecid) { + switch(flv_codecid) { + //no distinction between S16 and S8 PCM codec flags + case FLV_CODECID_PCM: + acodec->codec_id = acodec->bits_per_coded_sample == 8 ? AV_CODEC_ID_PCM_U8 : +#if HAVE_BIGENDIAN + AV_CODEC_ID_PCM_S16BE; +#else + AV_CODEC_ID_PCM_S16LE; +#endif + break; + case FLV_CODECID_PCM_LE: + acodec->codec_id = acodec->bits_per_coded_sample == 8 ? AV_CODEC_ID_PCM_U8 : AV_CODEC_ID_PCM_S16LE; break; + case FLV_CODECID_AAC : acodec->codec_id = AV_CODEC_ID_AAC; break; + case FLV_CODECID_ADPCM: acodec->codec_id = AV_CODEC_ID_ADPCM_SWF; break; + case FLV_CODECID_SPEEX: + acodec->codec_id = AV_CODEC_ID_SPEEX; + acodec->sample_rate = 16000; + break; + case FLV_CODECID_MP3 : acodec->codec_id = AV_CODEC_ID_MP3 ; astream->need_parsing = AVSTREAM_PARSE_FULL; break; + case FLV_CODECID_NELLYMOSER_8KHZ_MONO: + acodec->sample_rate = 8000; //in case metadata does not otherwise declare samplerate + acodec->codec_id = AV_CODEC_ID_NELLYMOSER; + break; + case FLV_CODECID_NELLYMOSER_16KHZ_MONO: + acodec->sample_rate = 16000; + acodec->codec_id = AV_CODEC_ID_NELLYMOSER; + break; + case FLV_CODECID_NELLYMOSER: + acodec->codec_id = AV_CODEC_ID_NELLYMOSER; + break; + case FLV_CODECID_PCM_MULAW: + acodec->sample_rate = 8000; + acodec->codec_id = AV_CODEC_ID_PCM_MULAW; + break; + case FLV_CODECID_PCM_ALAW: + acodec->sample_rate = 8000; + acodec->codec_id = AV_CODEC_ID_PCM_ALAW; + break; + default: + av_log(s, AV_LOG_INFO, "Unsupported audio codec (%x)\n", flv_codecid >> FLV_AUDIO_CODECID_OFFSET); + acodec->codec_tag = flv_codecid >> FLV_AUDIO_CODECID_OFFSET; + } +} + +static int flv_same_video_codec(AVCodecContext *vcodec, int flags) +{ + int flv_codecid = flags & FLV_VIDEO_CODECID_MASK; + + if (!vcodec->codec_id && !vcodec->codec_tag) + return 1; + + switch (flv_codecid) { + case FLV_CODECID_H263: + return vcodec->codec_id == AV_CODEC_ID_FLV1; + case FLV_CODECID_SCREEN: + return vcodec->codec_id == AV_CODEC_ID_FLASHSV; + case FLV_CODECID_SCREEN2: + return vcodec->codec_id == AV_CODEC_ID_FLASHSV2; + case FLV_CODECID_VP6: + return vcodec->codec_id == AV_CODEC_ID_VP6F; + case FLV_CODECID_VP6A: + return vcodec->codec_id == AV_CODEC_ID_VP6A; + case FLV_CODECID_H264: + return vcodec->codec_id == AV_CODEC_ID_H264; + default: + return vcodec->codec_tag == flv_codecid; + } +} + +static int flv_set_video_codec(AVFormatContext *s, AVStream *vstream, int flv_codecid, int read) { + AVCodecContext *vcodec = vstream->codec; + switch(flv_codecid) { + case FLV_CODECID_H263 : vcodec->codec_id = AV_CODEC_ID_FLV1 ; break; + case FLV_CODECID_REALH263: vcodec->codec_id = AV_CODEC_ID_H263 ; break; // Really mean it this time + case FLV_CODECID_SCREEN: vcodec->codec_id = AV_CODEC_ID_FLASHSV; break; + case FLV_CODECID_SCREEN2: vcodec->codec_id = AV_CODEC_ID_FLASHSV2; break; + case FLV_CODECID_VP6 : vcodec->codec_id = AV_CODEC_ID_VP6F ; + case FLV_CODECID_VP6A : + if(flv_codecid == FLV_CODECID_VP6A) + vcodec->codec_id = AV_CODEC_ID_VP6A; + if (read) { + if (vcodec->extradata_size != 1) { + vcodec->extradata = av_malloc(1 + FF_INPUT_BUFFER_PADDING_SIZE); + if (vcodec->extradata) + vcodec->extradata_size = 1; + } + if (vcodec->extradata) + vcodec->extradata[0] = avio_r8(s->pb); + else + avio_skip(s->pb, 1); + } + return 1; // 1 byte body size adjustment for flv_read_packet() + case FLV_CODECID_H264: + vcodec->codec_id = AV_CODEC_ID_H264; + return 3; // not 4, reading packet type will consume one byte + case FLV_CODECID_MPEG4: + vcodec->codec_id = AV_CODEC_ID_MPEG4; + return 3; + default: + av_log(s, AV_LOG_INFO, "Unsupported video codec (%x)\n", flv_codecid); + vcodec->codec_tag = flv_codecid; + } + + return 0; +} + +static int amf_get_string(AVIOContext *ioc, char *buffer, int buffsize) { + int length = avio_rb16(ioc); + if(length >= buffsize) { + avio_skip(ioc, length); + return -1; + } + + avio_read(ioc, buffer, length); + + buffer[length] = '\0'; + + return length; +} + +static int parse_keyframes_index(AVFormatContext *s, AVIOContext *ioc, AVStream *vstream, int64_t max_pos) { + FLVContext *flv = s->priv_data; + unsigned int timeslen = 0, fileposlen = 0, i; + char str_val[256]; + int64_t *times = NULL; + int64_t *filepositions = NULL; + int ret = AVERROR(ENOSYS); + int64_t initial_pos = avio_tell(ioc); + + if(vstream->nb_index_entries>0){ + av_log(s, AV_LOG_WARNING, "Skiping duplicate index\n"); + return 0; + } + + if (s->flags & AVFMT_FLAG_IGNIDX) + return 0; + + while (avio_tell(ioc) < max_pos - 2 && amf_get_string(ioc, str_val, sizeof(str_val)) > 0) { + int64_t** current_array; + unsigned int arraylen; + + // Expect array object in context + if (avio_r8(ioc) != AMF_DATA_TYPE_ARRAY) + break; + + arraylen = avio_rb32(ioc); + if(arraylen>>28) + break; + + if (!strcmp(KEYFRAMES_TIMESTAMP_TAG , str_val) && !times){ + current_array= × + timeslen= arraylen; + }else if (!strcmp(KEYFRAMES_BYTEOFFSET_TAG, str_val) && !filepositions){ + current_array= &filepositions; + fileposlen= arraylen; + }else // unexpected metatag inside keyframes, will not use such metadata for indexing + break; + + if (!(*current_array = av_mallocz(sizeof(**current_array) * arraylen))) { + ret = AVERROR(ENOMEM); + goto finish; + } + + for (i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++) { + if (avio_r8(ioc) != AMF_DATA_TYPE_NUMBER) + goto invalid; + current_array[0][i] = av_int2double(avio_rb64(ioc)); + } + if (times && filepositions) { + // All done, exiting at a position allowing amf_parse_object + // to finish parsing the object + ret = 0; + break; + } + } + + if (timeslen == fileposlen && fileposlen>1 && max_pos <= filepositions[0]) { + for (i = 0; i < fileposlen; i++) { + av_add_index_entry(vstream, filepositions[i], times[i]*1000, + 0, 0, AVINDEX_KEYFRAME); + if (i < 2) { + flv->validate_index[i].pos = filepositions[i]; + flv->validate_index[i].dts = times[i] * 1000; + flv->validate_count = i + 1; + } + } + } else { +invalid: + av_log(s, AV_LOG_WARNING, "Invalid keyframes object, skipping.\n"); + } + +finish: + av_freep(×); + av_freep(&filepositions); + avio_seek(ioc, initial_pos, SEEK_SET); + return ret; +} + +static int amf_parse_object(AVFormatContext *s, AVStream *astream, AVStream *vstream, const char *key, int64_t max_pos, int depth) { + AVCodecContext *acodec, *vcodec; + FLVContext *flv = s->priv_data; + AVIOContext *ioc; + AMFDataType amf_type; + char str_val[256]; + double num_val; + + num_val = 0; + ioc = s->pb; + + amf_type = avio_r8(ioc); + + switch(amf_type) { + case AMF_DATA_TYPE_NUMBER: + num_val = av_int2double(avio_rb64(ioc)); break; + case AMF_DATA_TYPE_BOOL: + num_val = avio_r8(ioc); break; + case AMF_DATA_TYPE_STRING: + if(amf_get_string(ioc, str_val, sizeof(str_val)) < 0) + return -1; + break; + case AMF_DATA_TYPE_OBJECT: + if ((vstream || astream) && ioc->seekable && key && !strcmp(KEYFRAMES_TAG, key) && depth == 1) + if (parse_keyframes_index(s, ioc, vstream ? vstream : astream, + max_pos) < 0) + av_log(s, AV_LOG_ERROR, "Keyframe index parsing failed\n"); + + while (avio_tell(ioc) < max_pos - 2 && amf_get_string(ioc, str_val, sizeof(str_val)) > 0) { + if (amf_parse_object(s, astream, vstream, str_val, max_pos, depth + 1) < 0) + return -1; //if we couldn't skip, bomb out. + } + if(avio_r8(ioc) != AMF_END_OF_OBJECT) + return -1; + break; + case AMF_DATA_TYPE_NULL: + case AMF_DATA_TYPE_UNDEFINED: + case AMF_DATA_TYPE_UNSUPPORTED: + break; //these take up no additional space + case AMF_DATA_TYPE_MIXEDARRAY: + avio_skip(ioc, 4); //skip 32-bit max array index + while(avio_tell(ioc) < max_pos - 2 && amf_get_string(ioc, str_val, sizeof(str_val)) > 0) { + //this is the only case in which we would want a nested parse to not skip over the object + if(amf_parse_object(s, astream, vstream, str_val, max_pos, depth + 1) < 0) + return -1; + } + if(avio_r8(ioc) != AMF_END_OF_OBJECT) + return -1; + break; + case AMF_DATA_TYPE_ARRAY: { + unsigned int arraylen, i; + + arraylen = avio_rb32(ioc); + for(i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++) { + if(amf_parse_object(s, NULL, NULL, NULL, max_pos, depth + 1) < 0) + return -1; //if we couldn't skip, bomb out. + } + } + break; + case AMF_DATA_TYPE_DATE: + avio_skip(ioc, 8 + 2); //timestamp (double) and UTC offset (int16) + break; + default: //unsupported type, we couldn't skip + return -1; + } + + if(depth == 1 && key) { //only look for metadata values when we are not nested and key != NULL + acodec = astream ? astream->codec : NULL; + vcodec = vstream ? vstream->codec : NULL; + + if (amf_type == AMF_DATA_TYPE_NUMBER) { + if (!strcmp(key, "duration")) + s->duration = num_val * AV_TIME_BASE; + else if (!strcmp(key, "videodatarate") && vcodec && 0 <= (int)(num_val * 1024.0)) + vcodec->bit_rate = num_val * 1024.0; + else if (!strcmp(key, "audiodatarate") && acodec && 0 <= (int)(num_val * 1024.0)) + acodec->bit_rate = num_val * 1024.0; + else if (!strcmp(key, "datastream")) { + AVStream *st = create_stream(s, AVMEDIA_TYPE_DATA); + if (!st) + return AVERROR(ENOMEM); + st->codec->codec_id = AV_CODEC_ID_TEXT; + } else if (flv->trust_metadata) { + if (!strcmp(key, "videocodecid") && vcodec) { + flv_set_video_codec(s, vstream, num_val, 0); + } else + if (!strcmp(key, "audiocodecid") && acodec) { + flv_set_audio_codec(s, astream, acodec, num_val); + } else + if (!strcmp(key, "audiosamplerate") && acodec) { + acodec->sample_rate = num_val; + } else + if (!strcmp(key, "width") && vcodec) { + vcodec->width = num_val; + } else + if (!strcmp(key, "height") && vcodec) { + vcodec->height = num_val; + } + } + } + + if (amf_type == AMF_DATA_TYPE_OBJECT && s->nb_streams == 1 && + ((!acodec && !strcmp(key, "audiocodecid")) || + (!vcodec && !strcmp(key, "videocodecid")))) + s->ctx_flags &= ~AVFMTCTX_NOHEADER; //If there is either audio/video missing, codecid will be an empty object + + if (!strcmp(key, "duration") || + !strcmp(key, "filesize") || + !strcmp(key, "width") || + !strcmp(key, "height") || + !strcmp(key, "videodatarate") || + !strcmp(key, "framerate") || + !strcmp(key, "videocodecid") || + !strcmp(key, "audiodatarate") || + !strcmp(key, "audiosamplerate") || + !strcmp(key, "audiosamplesize") || + !strcmp(key, "stereo") || + !strcmp(key, "audiocodecid")) + return 0; + + if(amf_type == AMF_DATA_TYPE_BOOL) { + av_strlcpy(str_val, num_val > 0 ? "true" : "false", sizeof(str_val)); + av_dict_set(&s->metadata, key, str_val, 0); + } else if(amf_type == AMF_DATA_TYPE_NUMBER) { + snprintf(str_val, sizeof(str_val), "%.f", num_val); + av_dict_set(&s->metadata, key, str_val, 0); + } else if (amf_type == AMF_DATA_TYPE_STRING) + av_dict_set(&s->metadata, key, str_val, 0); + } + + return 0; +} + +static int flv_read_metabody(AVFormatContext *s, int64_t next_pos) { + AMFDataType type; + AVStream *stream, *astream, *vstream, *dstream; + AVIOContext *ioc; + int i; + char buffer[11]; //only needs to hold the string "onMetaData". Anything longer is something we don't want. + + vstream = astream = dstream = NULL; + ioc = s->pb; + + //first object needs to be "onMetaData" string + type = avio_r8(ioc); + if (type != AMF_DATA_TYPE_STRING || + amf_get_string(ioc, buffer, sizeof(buffer)) < 0) + return -1; + + if (!strcmp(buffer, "onTextData")) + return 1; + + if (strcmp(buffer, "onMetaData")) + return -1; + + //find the streams now so that amf_parse_object doesn't need to do the lookup every time it is called. + for(i = 0; i < s->nb_streams; i++) { + stream = s->streams[i]; + if(stream->codec->codec_type == AVMEDIA_TYPE_VIDEO) vstream = stream; + else if(stream->codec->codec_type == AVMEDIA_TYPE_AUDIO) astream = stream; + else if(stream->codec->codec_type == AVMEDIA_TYPE_DATA) dstream = stream; + } + + //parse the second object (we want a mixed array) + if(amf_parse_object(s, astream, vstream, buffer, next_pos, 0) < 0) + return -1; + + return 0; +} + +static int flv_read_header(AVFormatContext *s) +{ + int offset, flags; + + avio_skip(s->pb, 4); + flags = avio_r8(s->pb); + /* old flvtool cleared this field */ + /* FIXME: better fix needed */ + if (!flags) { + flags = FLV_HEADER_FLAG_HASVIDEO | FLV_HEADER_FLAG_HASAUDIO; + av_log(s, AV_LOG_WARNING, "Broken FLV file, which says no streams present, this might fail\n"); + } + + s->ctx_flags |= AVFMTCTX_NOHEADER; + + if(flags & FLV_HEADER_FLAG_HASVIDEO){ + if(!create_stream(s, AVMEDIA_TYPE_VIDEO)) + return AVERROR(ENOMEM); + } + if(flags & FLV_HEADER_FLAG_HASAUDIO){ + if(!create_stream(s, AVMEDIA_TYPE_AUDIO)) + return AVERROR(ENOMEM); + } + // Flag doesn't indicate whether or not there is script-data present. Must + // create that stream if it's encountered. + + offset = avio_rb32(s->pb); + avio_seek(s->pb, offset, SEEK_SET); + avio_skip(s->pb, 4); + + s->start_time = 0; + + return 0; +} + +static int flv_read_close(AVFormatContext *s) +{ + int i; + FLVContext *flv = s->priv_data; + for(i=0; i<FLV_STREAM_TYPE_NB; i++) + av_freep(&flv->new_extradata[i]); + return 0; +} + +static int flv_get_extradata(AVFormatContext *s, AVStream *st, int size) +{ + av_free(st->codec->extradata); + st->codec->extradata = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE); + if (!st->codec->extradata) + return AVERROR(ENOMEM); + st->codec->extradata_size = size; + avio_read(s->pb, st->codec->extradata, st->codec->extradata_size); + return 0; +} + +static int flv_queue_extradata(FLVContext *flv, AVIOContext *pb, int stream, + int size) +{ + av_free(flv->new_extradata[stream]); + flv->new_extradata[stream] = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE); + if (!flv->new_extradata[stream]) + return AVERROR(ENOMEM); + flv->new_extradata_size[stream] = size; + avio_read(pb, flv->new_extradata[stream], size); + return 0; +} + +static void clear_index_entries(AVFormatContext *s, int64_t pos) +{ + int i, j, out; + av_log(s, AV_LOG_WARNING, "Found invalid index entries, clearing the index.\n"); + for (i = 0; i < s->nb_streams; i++) { + AVStream *st = s->streams[i]; + /* Remove all index entries that point to >= pos */ + out = 0; + for (j = 0; j < st->nb_index_entries; j++) { + if (st->index_entries[j].pos < pos) + st->index_entries[out++] = st->index_entries[j]; + } + st->nb_index_entries = out; + } +} + + +static int flv_data_packet(AVFormatContext *s, AVPacket *pkt, + int64_t dts, int64_t next) +{ + int ret = AVERROR_INVALIDDATA, i; + AVIOContext *pb = s->pb; + AVStream *st = NULL; + AMFDataType type; + char buf[20]; + int length; + + type = avio_r8(pb); + if (type == AMF_DATA_TYPE_MIXEDARRAY) + avio_seek(pb, 4, SEEK_CUR); + else if (type != AMF_DATA_TYPE_OBJECT) + goto out; + + amf_get_string(pb, buf, sizeof(buf)); + if (strcmp(buf, "type") || avio_r8(pb) != AMF_DATA_TYPE_STRING) + goto out; + + amf_get_string(pb, buf, sizeof(buf)); + //FIXME parse it as codec_id + amf_get_string(pb, buf, sizeof(buf)); + if (strcmp(buf, "text") || avio_r8(pb) != AMF_DATA_TYPE_STRING) + goto out; + + length = avio_rb16(pb); + ret = av_get_packet(s->pb, pkt, length); + if (ret < 0) { + ret = AVERROR(EIO); + goto out; + } + + for (i = 0; i < s->nb_streams; i++) { + st = s->streams[i]; + if (st->codec->codec_type == AVMEDIA_TYPE_DATA) + break; + } + + if (i == s->nb_streams) { + st = create_stream(s, AVMEDIA_TYPE_DATA); + if (!st) + goto out; + st->codec->codec_id = AV_CODEC_ID_TEXT; + } + + pkt->dts = dts; + pkt->pts = dts; + pkt->size = ret; + + pkt->stream_index = st->index; + pkt->flags |= AV_PKT_FLAG_KEY; + + avio_seek(s->pb, next + 4, SEEK_SET); +out: + return ret; +} + +static int flv_read_packet(AVFormatContext *s, AVPacket *pkt) +{ + FLVContext *flv = s->priv_data; + int ret, i, type, size, flags; + int stream_type=-1; + int64_t next, pos; + int64_t dts, pts = AV_NOPTS_VALUE; + int av_uninit(channels); + int av_uninit(sample_rate); + AVStream *st = NULL; + + for(;;avio_skip(s->pb, 4)){ /* pkt size is repeated at end. skip it */ + pos = avio_tell(s->pb); + type = avio_r8(s->pb); + size = avio_rb24(s->pb); + dts = avio_rb24(s->pb); + dts |= avio_r8(s->pb) << 24; + av_dlog(s, "type:%d, size:%d, dts:%"PRId64"\n", type, size, dts); + if (url_feof(s->pb)) + return AVERROR_EOF; + avio_skip(s->pb, 3); /* stream id, always 0 */ + flags = 0; + + if (flv->validate_next < flv->validate_count) { + int64_t validate_pos = flv->validate_index[flv->validate_next].pos; + if (pos == validate_pos) { + if (FFABS(dts - flv->validate_index[flv->validate_next].dts) <= + VALIDATE_INDEX_TS_THRESH) { + flv->validate_next++; + } else { + clear_index_entries(s, validate_pos); + flv->validate_count = 0; + } + } else if (pos > validate_pos) { + clear_index_entries(s, validate_pos); + flv->validate_count = 0; + } + } + + if(size == 0) + continue; + + next= size + avio_tell(s->pb); + + if (type == FLV_TAG_TYPE_AUDIO) { + stream_type=FLV_STREAM_TYPE_AUDIO; + flags = avio_r8(s->pb); + size--; + } else if (type == FLV_TAG_TYPE_VIDEO) { + stream_type=FLV_STREAM_TYPE_VIDEO; + flags = avio_r8(s->pb); + size--; + if ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_VIDEO_INFO_CMD) + goto skip; + } else if (type == FLV_TAG_TYPE_META) { + if (size > 13+1+4 && dts == 0) { // Header-type metadata stuff + flv_read_metabody(s, next); + goto skip; + } else if (dts != 0) { // Script-data "special" metadata frames - don't skip + stream_type=FLV_STREAM_TYPE_DATA; + } else { + goto skip; + } + } else { + av_log(s, AV_LOG_DEBUG, "skipping flv packet: type %d, size %d, flags %d\n", type, size, flags); + skip: + avio_seek(s->pb, next, SEEK_SET); + continue; + } + + /* skip empty data packets */ + if (!size) + continue; + + /* now find stream */ + for(i=0;i<s->nb_streams;i++) { + st = s->streams[i]; + if (stream_type == FLV_STREAM_TYPE_AUDIO) { + if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && + (s->audio_codec_id || flv_same_audio_codec(st->codec, flags))) { + break; + } + } else + if (stream_type == FLV_STREAM_TYPE_VIDEO) { + if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && + (s->video_codec_id || flv_same_video_codec(st->codec, flags))) { + break; + } + } else if (stream_type == FLV_STREAM_TYPE_DATA) { + if (st->codec->codec_type == AVMEDIA_TYPE_DATA) + break; + } + } + if(i == s->nb_streams){ + av_log(s, AV_LOG_WARNING, "Stream discovered after head already parsed\n"); + st = create_stream(s, + (int[]){AVMEDIA_TYPE_VIDEO, AVMEDIA_TYPE_AUDIO, AVMEDIA_TYPE_DATA}[stream_type]); + if (!st) + return AVERROR(ENOMEM); + + } + av_dlog(s, "%d %X %d \n", stream_type, flags, st->discard); + if( (st->discard >= AVDISCARD_NONKEY && !((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY || (stream_type == FLV_STREAM_TYPE_AUDIO))) + ||(st->discard >= AVDISCARD_BIDIR && ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_DISP_INTER && (stream_type == FLV_STREAM_TYPE_VIDEO))) + || st->discard >= AVDISCARD_ALL + ){ + avio_seek(s->pb, next, SEEK_SET); + continue; + } + if ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY) + av_add_index_entry(st, pos, dts, size, 0, AVINDEX_KEYFRAME); + break; + } + + // if not streamed and no duration from metadata then seek to end to find the duration from the timestamps + if(s->pb->seekable && (!s->duration || s->duration==AV_NOPTS_VALUE) && !flv->searched_for_end){ + int size; + const int64_t pos= avio_tell(s->pb); + int64_t fsize= avio_size(s->pb); +retry_duration: + avio_seek(s->pb, fsize-4, SEEK_SET); + size= avio_rb32(s->pb); + avio_seek(s->pb, fsize-3-size, SEEK_SET); + if(size == avio_rb24(s->pb) + 11){ + uint32_t ts = avio_rb24(s->pb); + ts |= avio_r8(s->pb) << 24; + if(ts) + s->duration = ts * (int64_t)AV_TIME_BASE / 1000; + else if (fsize >= 8 && fsize - 8 >= size){ + fsize -= size+4; + goto retry_duration; + } + } + + avio_seek(s->pb, pos, SEEK_SET); + flv->searched_for_end = 1; + } + + if(stream_type == FLV_STREAM_TYPE_AUDIO){ + int bits_per_coded_sample; + channels = (flags & FLV_AUDIO_CHANNEL_MASK) == FLV_STEREO ? 2 : 1; + sample_rate = (44100 << ((flags & FLV_AUDIO_SAMPLERATE_MASK) >> FLV_AUDIO_SAMPLERATE_OFFSET) >> 3); + bits_per_coded_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8; + if(!st->codec->channels || !st->codec->sample_rate || !st->codec->bits_per_coded_sample) { + st->codec->channels = channels; + st->codec->channel_layout = channels == 1 ? AV_CH_LAYOUT_MONO : + AV_CH_LAYOUT_STEREO; + st->codec->sample_rate = sample_rate; + st->codec->bits_per_coded_sample = bits_per_coded_sample; + } + if(!st->codec->codec_id){ + flv_set_audio_codec(s, st, st->codec, flags & FLV_AUDIO_CODECID_MASK); + flv->last_sample_rate = sample_rate = st->codec->sample_rate; + flv->last_channels = channels = st->codec->channels; + } else { + AVCodecContext ctx; + ctx.sample_rate = sample_rate; + flv_set_audio_codec(s, st, &ctx, flags & FLV_AUDIO_CODECID_MASK); + sample_rate = ctx.sample_rate; + } + } else if(stream_type == FLV_STREAM_TYPE_VIDEO) { + size -= flv_set_video_codec(s, st, flags & FLV_VIDEO_CODECID_MASK, 1); + } + + if (st->codec->codec_id == AV_CODEC_ID_AAC || + st->codec->codec_id == AV_CODEC_ID_H264 || + st->codec->codec_id == AV_CODEC_ID_MPEG4) { + int type = avio_r8(s->pb); + size--; + if (st->codec->codec_id == AV_CODEC_ID_H264 || st->codec->codec_id == AV_CODEC_ID_MPEG4) { + int32_t cts = (avio_rb24(s->pb)+0xff800000)^0xff800000; // sign extension + pts = dts + cts; + if (cts < 0) { // dts are wrong + flv->wrong_dts = 1; + av_log(s, AV_LOG_WARNING, "negative cts, previous timestamps might be wrong\n"); + } + if (flv->wrong_dts) + dts = AV_NOPTS_VALUE; + } + if (type == 0 && (!st->codec->extradata || st->codec->codec_id == AV_CODEC_ID_AAC)) { + if (st->codec->extradata) { + if ((ret = flv_queue_extradata(flv, s->pb, stream_type, size)) < 0) + return ret; + ret = AVERROR(EAGAIN); + goto leave; + } + if ((ret = flv_get_extradata(s, st, size)) < 0) + return ret; + if (st->codec->codec_id == AV_CODEC_ID_AAC && 0) { + MPEG4AudioConfig cfg; + if (avpriv_mpeg4audio_get_config(&cfg, st->codec->extradata, + st->codec->extradata_size * 8, 1) >= 0) { + st->codec->channels = cfg.channels; + st->codec->channel_layout = 0; + if (cfg.ext_sample_rate) + st->codec->sample_rate = cfg.ext_sample_rate; + else + st->codec->sample_rate = cfg.sample_rate; + av_dlog(s, "mp4a config channels %d sample rate %d\n", + st->codec->channels, st->codec->sample_rate); + } + } + + ret = AVERROR(EAGAIN); + goto leave; + } + } + + /* skip empty data packets */ + if (!size) { + ret = AVERROR(EAGAIN); + goto leave; + } + + ret= av_get_packet(s->pb, pkt, size); + if (ret < 0) + return ret; + pkt->dts = dts; + pkt->pts = pts == AV_NOPTS_VALUE ? dts : pts; + pkt->stream_index = st->index; + if (flv->new_extradata[stream_type]) { + uint8_t *side = av_packet_new_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA, + flv->new_extradata_size[stream_type]); + if (side) { + memcpy(side, flv->new_extradata[stream_type], + flv->new_extradata_size[stream_type]); + av_freep(&flv->new_extradata[stream_type]); + flv->new_extradata_size[stream_type] = 0; + } + } + if (stream_type == FLV_STREAM_TYPE_AUDIO && (sample_rate != flv->last_sample_rate || + channels != flv->last_channels)) { + flv->last_sample_rate = sample_rate; + flv->last_channels = channels; + ff_add_param_change(pkt, channels, 0, sample_rate, 0, 0); + } + + if ( stream_type == FLV_STREAM_TYPE_AUDIO || + ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY) || + stream_type == FLV_STREAM_TYPE_DATA) + pkt->flags |= AV_PKT_FLAG_KEY; + +leave: + avio_skip(s->pb, 4); + return ret; +} + +static int flv_read_seek(AVFormatContext *s, int stream_index, + int64_t ts, int flags) +{ + FLVContext *flv = s->priv_data; + flv->validate_count = 0; + return avio_seek_time(s->pb, stream_index, ts, flags); +} + +#define OFFSET(x) offsetof(FLVContext, x) +#define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM +static const AVOption options[] = { + { "flv_metadata", "Allocate streams according the onMetaData array", OFFSET(trust_metadata), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VD}, + { NULL } +}; + +static const AVClass class = { + .class_name = "flvdec", + .item_name = av_default_item_name, + .option = options, + .version = LIBAVUTIL_VERSION_INT, +}; + +AVInputFormat ff_flv_demuxer = { + .name = "flv", + .long_name = NULL_IF_CONFIG_SMALL("FLV (Flash Video)"), + .priv_data_size = sizeof(FLVContext), + .read_probe = flv_probe, + .read_header = flv_read_header, + .read_packet = flv_read_packet, + .read_seek = flv_read_seek, + .read_close = flv_read_close, + .extensions = "flv", + .priv_class = &class, +}; |