| /* |
| * 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 FLVContext { |
| 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 probe(AVProbeData *p, int live) |
| { |
| const uint8_t *d = p->buf; |
| unsigned offset = AV_RB32(d + 5); |
| |
| if (d[0] == 'F' && |
| d[1] == 'L' && |
| d[2] == 'V' && |
| d[3] < 5 && d[5] == 0 && |
| offset + 100 < p->buf_size && |
| offset > 8) { |
| int is_live = !memcmp(d + offset + 40, "NGINX RTMP", 10); |
| |
| if (live == is_live) |
| return AVPROBE_SCORE_MAX; |
| } |
| return 0; |
| } |
| |
| static int flv_probe(AVProbeData *p) |
| { |
| return probe(p, 0); |
| } |
| |
| static int live_flv_probe(AVProbeData *p) |
| { |
| return probe(p, 1); |
| } |
| |
| 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: |
| // in case metadata does not otherwise declare samplerate |
| acodec->sample_rate = 8000; |
| 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: |
| avpriv_request_sample(s, "Audio codec (%x)", |
| 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) { |
| ff_alloc_extradata(vcodec, 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; |
| vstream->need_parsing = AVSTREAM_PARSE_HEADERS; |
| 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: |
| avpriv_request_sample(s, "Video codec (%x)", 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, "Skipping 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[1024]; |
| 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) { |
| av_log(s, AV_LOG_ERROR, "AMF_DATA_TYPE_STRING parsing failed\n"); |
| return -1; |
| } |
| break; |
| case AMF_DATA_TYPE_OBJECT: |
| if ((vstream || astream) && key && |
| ioc->seekable && |
| !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) { |
| av_log(s, AV_LOG_ERROR, "Missing AMF_END_OF_OBJECT in AMF_DATA_TYPE_OBJECT\n"); |
| 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) { |
| av_log(s, AV_LOG_ERROR, "Missing AMF_END_OF_OBJECT in AMF_DATA_TYPE_MIXEDARRAY\n"); |
| 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 |
| av_log(s, AV_LOG_ERROR, "unsupported amf type %d\n", amf_type); |
| return -1; |
| } |
| |
| if (key) { |
| acodec = astream ? astream->codec : NULL; |
| vcodec = vstream ? vstream->codec : NULL; |
| |
| // stream info doesn't live any deeper than the first object |
| if (depth == 1) { |
| if (amf_type == AMF_DATA_TYPE_NUMBER || |
| amf_type == AMF_DATA_TYPE_BOOL) { |
| 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) { |
| int id = ((int)num_val) << FLV_AUDIO_CODECID_OFFSET; |
| flv_set_audio_codec(s, astream, acodec, id); |
| } else if (!strcmp(key, "audiosamplerate") && acodec) { |
| acodec->sample_rate = num_val; |
| } else if (!strcmp(key, "audiosamplesize") && acodec) { |
| acodec->bits_per_coded_sample = num_val; |
| } else if (!strcmp(key, "stereo") && acodec) { |
| acodec->channels = num_val + 1; |
| acodec->channel_layout = acodec->channels == 2 ? |
| AV_CH_LAYOUT_STEREO : |
| AV_CH_LAYOUT_MONO; |
| } 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") || |
| !strcmp(key, "datastream")) |
| return 0; |
| |
| s->event_flags |= AVFMT_EVENT_FLAG_METADATA_UPDATED; |
| 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; |
| } |
| |
| #define TYPE_ONTEXTDATA 1 |
| #define TYPE_UNKNOWN 2 |
| |
| static int flv_read_metabody(AVFormatContext *s, int64_t next_pos) |
| { |
| AMFDataType type; |
| AVStream *stream, *astream, *vstream; |
| AVStream av_unused *dstream; |
| AVIOContext *ioc; |
| int i; |
| // only needs to hold the string "onMetaData". |
| // Anything longer is something we don't want. |
| char buffer[11]; |
| |
| astream = NULL; |
| vstream = NULL; |
| 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 TYPE_UNKNOWN; |
| |
| if (!strcmp(buffer, "onTextData")) |
| return TYPE_ONTEXTDATA; |
| |
| if (strcmp(buffer, "onMetaData") && strcmp(buffer, "onCuePoint")) |
| return TYPE_UNKNOWN; |
| |
| // 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); |
| |
| 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_freep(&st->codec->extradata); |
| if (ff_get_extradata(st->codec, s->pb, size) < 0) |
| return AVERROR(ENOMEM); |
| 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 amf_skip_tag(AVIOContext *pb, AMFDataType type) |
| { |
| int nb = -1, ret, parse_name = 1; |
| |
| switch (type) { |
| case AMF_DATA_TYPE_NUMBER: |
| avio_skip(pb, 8); |
| break; |
| case AMF_DATA_TYPE_BOOL: |
| avio_skip(pb, 1); |
| break; |
| case AMF_DATA_TYPE_STRING: |
| avio_skip(pb, avio_rb16(pb)); |
| break; |
| case AMF_DATA_TYPE_ARRAY: |
| parse_name = 0; |
| case AMF_DATA_TYPE_MIXEDARRAY: |
| nb = avio_rb32(pb); |
| case AMF_DATA_TYPE_OBJECT: |
| while(!pb->eof_reached && (nb-- > 0 || type != AMF_DATA_TYPE_ARRAY)) { |
| if (parse_name) { |
| int size = avio_rb16(pb); |
| if (!size) { |
| avio_skip(pb, 1); |
| break; |
| } |
| avio_skip(pb, size); |
| } |
| if ((ret = amf_skip_tag(pb, avio_r8(pb))) < 0) |
| return ret; |
| } |
| break; |
| case AMF_DATA_TYPE_NULL: |
| case AMF_DATA_TYPE_OBJECT_END: |
| break; |
| default: |
| return AVERROR_INVALIDDATA; |
| } |
| return 0; |
| } |
| |
| static int flv_data_packet(AVFormatContext *s, AVPacket *pkt, |
| int64_t dts, int64_t next) |
| { |
| AVIOContext *pb = s->pb; |
| AVStream *st = NULL; |
| char buf[20]; |
| int ret = AVERROR_INVALIDDATA; |
| int i, length = -1; |
| |
| switch (avio_r8(pb)) { |
| case AMF_DATA_TYPE_MIXEDARRAY: |
| avio_seek(pb, 4, SEEK_CUR); |
| case AMF_DATA_TYPE_OBJECT: |
| break; |
| default: |
| goto skip; |
| } |
| |
| while ((ret = amf_get_string(pb, buf, sizeof(buf))) > 0) { |
| AMFDataType type = avio_r8(pb); |
| if (type == AMF_DATA_TYPE_STRING && !strcmp(buf, "text")) { |
| length = avio_rb16(pb); |
| ret = av_get_packet(pb, pkt, length); |
| if (ret < 0) |
| goto skip; |
| else |
| break; |
| } else { |
| if ((ret = amf_skip_tag(pb, type)) < 0) |
| goto skip; |
| } |
| } |
| |
| if (length < 0) { |
| ret = AVERROR_INVALIDDATA; |
| goto skip; |
| } |
| |
| 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) |
| return AVERROR(ENOMEM); |
| 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; |
| |
| skip: |
| avio_seek(s->pb, next + 4, SEEK_SET); |
| |
| 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, meta_pos; |
| int64_t dts, pts = AV_NOPTS_VALUE; |
| int av_uninit(channels); |
| int av_uninit(sample_rate); |
| AVStream *st = NULL; |
| |
| /* pkt size is repeated at end. skip it */ |
| for (;; avio_skip(s->pb, 4)) { |
| pos = avio_tell(s->pb); |
| type = (avio_r8(s->pb) & 0x1F); |
| 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" pos:%"PRId64"\n", type, size, dts, avio_tell(s->pb)); |
| if (avio_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) { |
| stream_type=FLV_STREAM_TYPE_DATA; |
| if (size > 13 + 1 + 4 && dts == 0) { // Header-type metadata stuff |
| meta_pos = avio_tell(s->pb); |
| if (flv_read_metabody(s, next) <= 0) { |
| goto skip; |
| } |
| avio_seek(s->pb, meta_pos, SEEK_SET); |
| } |
| } 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) { |
| static const enum AVMediaType stream_types[] = {AVMEDIA_TYPE_VIDEO, AVMEDIA_TYPE_AUDIO, AVMEDIA_TYPE_DATA}; |
| av_log(s, AV_LOG_WARNING, "Stream discovered after head already parsed\n"); |
| st = create_stream(s, stream_types[stream_type]); |
| if (!st) |
| return AVERROR(ENOMEM); |
| |
| } |
| av_dlog(s, "%d %X %d \n", stream_type, flags, st->discard); |
| |
| if ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY || |
| stream_type == FLV_STREAM_TYPE_AUDIO) |
| av_add_index_entry(st, pos, dts, size, 0, AVINDEX_KEYFRAME); |
| |
| 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; |
| } |
| 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); |
| // Read the last 4 bytes of the file, this should be the size of the |
| // previous FLV tag. Use the timestamp of its payload as duration. |
| int64_t fsize = avio_size(s->pb); |
| retry_duration: |
| avio_seek(s->pb, fsize - 4, SEEK_SET); |
| size = avio_rb32(s->pb); |
| // Seek to the start of the last FLV tag at position (fsize - 4 - size) |
| // but skip the byte indicating the type. |
| 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 = {0}; |
| ctx.sample_rate = sample_rate; |
| ctx.bits_per_coded_sample = bits_per_coded_sample; |
| 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) { |
| // sign extension |
| int32_t cts = (avio_rb24(s->pb) + 0xff800000) ^ 0xff800000; |
| pts = dts + cts; |
| if (cts < 0) { // dts might be wrong |
| if (!flv->wrong_dts) |
| av_log(s, AV_LOG_WARNING, |
| "Negative cts, previous timestamps might be wrong.\n"); |
| flv->wrong_dts = 1; |
| } else if (FFABS(dts - pts) > 1000*60*15) { |
| av_log(s, AV_LOG_WARNING, |
| "invalid timestamps %"PRId64" %"PRId64"\n", dts, pts); |
| dts = pts = AV_NOPTS_VALUE; |
| } |
| } |
| if (type == 0 && (!st->codec->extradata || st->codec->codec_id == AV_CODEC_ID_AAC || |
| st->codec->codec_id == AV_CODEC_ID_H264)) { |
| AVDictionaryEntry *t; |
| |
| 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; |
| |
| /* Workaround for buggy Omnia A/XE encoder */ |
| t = av_dict_get(s->metadata, "Encoder", NULL, 0); |
| if (st->codec->codec_id == AV_CODEC_ID_AAC && t && !strcmp(t->value, "Omnia A/XE")) |
| st->codec->extradata_size = 2; |
| |
| 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 to the onMetaData array", OFFSET(trust_metadata), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VD }, |
| { NULL } |
| }; |
| |
| static const AVClass flv_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 = &flv_class, |
| }; |
| |
| static const AVClass live_flv_class = { |
| .class_name = "live_flvdec", |
| .item_name = av_default_item_name, |
| .option = options, |
| .version = LIBAVUTIL_VERSION_INT, |
| }; |
| |
| AVInputFormat ff_live_flv_demuxer = { |
| .name = "live_flv", |
| .long_name = NULL_IF_CONFIG_SMALL("live RTMP FLV (Flash Video)"), |
| .priv_data_size = sizeof(FLVContext), |
| .read_probe = live_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 = &live_flv_class, |
| .flags = AVFMT_TS_DISCONT |
| }; |