diff options
Diffstat (limited to 'contrib/ffmpeg/libavformat/flvdec.c')
| -rw-r--r-- | contrib/ffmpeg/libavformat/flvdec.c | 395 |
1 files changed, 395 insertions, 0 deletions
diff --git a/contrib/ffmpeg/libavformat/flvdec.c b/contrib/ffmpeg/libavformat/flvdec.c new file mode 100644 index 000000000..bf91fbbc7 --- /dev/null +++ b/contrib/ffmpeg/libavformat/flvdec.c @@ -0,0 +1,395 @@ +/* + * FLV demuxer + * Copyright (c) 2003 The FFmpeg Project. + * + * 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 + * + * + * 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 + */ +#include "avformat.h" +#include "flv.h" + +static int flv_probe(AVProbeData *p) +{ + const uint8_t *d; + + if (p->buf_size < 6) + return 0; + d = p->buf; + if (d[0] == 'F' && d[1] == 'L' && d[2] == 'V' && d[3] < 5 && d[5]==0) { + return AVPROBE_SCORE_MAX; + } + return 0; +} + +static void flv_set_audio_codec(AVFormatContext *s, AVStream *astream, int flv_codecid) { + AVCodecContext *acodec = astream->codec; + switch(flv_codecid) { + //no distinction between S16 and S8 PCM codec flags + case FLV_CODECID_PCM_BE: + acodec->codec_id = acodec->bits_per_sample == 8 ? CODEC_ID_PCM_S8 : CODEC_ID_PCM_S16BE; break; + case FLV_CODECID_PCM_LE: + acodec->codec_id = acodec->bits_per_sample == 8 ? CODEC_ID_PCM_S8 : CODEC_ID_PCM_S16LE; break; + case FLV_CODECID_ADPCM: acodec->codec_id = CODEC_ID_ADPCM_SWF; break; + case FLV_CODECID_MP3 : acodec->codec_id = CODEC_ID_MP3 ; astream->need_parsing = 1 ; break; + case FLV_CODECID_NELLYMOSER_8HZ_MONO: + acodec->sample_rate = 8000; //in case metadata does not otherwise declare samplerate + case FLV_CODECID_NELLYMOSER: + 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_set_video_codec(AVFormatContext *s, AVStream *vstream, int flv_codecid) { + AVCodecContext *vcodec = vstream->codec; + switch(flv_codecid) { + case FLV_CODECID_H263 : vcodec->codec_id = CODEC_ID_FLV1 ; break; + case FLV_CODECID_SCREEN: vcodec->codec_id = CODEC_ID_FLASHSV; break; + case FLV_CODECID_VP6 : vcodec->codec_id = CODEC_ID_VP6F ; + if(vcodec->extradata_size != 1) { + vcodec->extradata_size = 1; + vcodec->extradata = av_malloc(1); + } + vcodec->extradata[0] = get_byte(&s->pb); + return 1; // 1 byte body size adjustment for flv_read_packet() + 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(ByteIOContext *ioc, char *buffer, int buffsize) { + int length = get_be16(ioc); + if(length >= buffsize) { + url_fskip(ioc, length); + return -1; + } + + get_buffer(ioc, buffer, length); + + buffer[length] = '\0'; + + return length; +} + +static int amf_parse_object(AVFormatContext *s, AVStream *astream, AVStream *vstream, const char *key, unsigned int max_pos, int depth) { + AVCodecContext *acodec, *vcodec; + ByteIOContext *ioc; + AMFDataType amf_type; + char str_val[256]; + double num_val; + + num_val = 0; + ioc = &s->pb; + + amf_type = get_byte(ioc); + + switch(amf_type) { + case AMF_DATA_TYPE_NUMBER: + num_val = av_int2dbl(get_be64(ioc)); break; + case AMF_DATA_TYPE_BOOL: + num_val = get_byte(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: { + unsigned int keylen; + + while(url_ftell(ioc) < max_pos - 2 && (keylen = get_be16(ioc))) { + url_fskip(ioc, keylen); //skip key string + if(amf_parse_object(s, NULL, NULL, NULL, max_pos, depth + 1) < 0) + return -1; //if we couldn't skip, bomb out. + } + if(get_byte(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: + url_fskip(ioc, 4); //skip 32-bit max array index + while(url_ftell(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(get_byte(ioc) != AMF_END_OF_OBJECT) + return -1; + break; + case AMF_DATA_TYPE_ARRAY: { + unsigned int arraylen, i; + + arraylen = get_be32(ioc); + for(i = 0; i < arraylen && url_ftell(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: + url_fskip(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_BOOL) { + if(!strcmp(key, "stereo") && acodec) acodec->channels = num_val > 0 ? 2 : 1; + } else if(amf_type == AMF_DATA_TYPE_NUMBER) { + if(!strcmp(key, "duration")) s->duration = num_val * AV_TIME_BASE; +// else if(!strcmp(key, "width") && vcodec && num_val > 0) vcodec->width = num_val; +// else if(!strcmp(key, "height") && vcodec && num_val > 0) vcodec->height = num_val; + else if(!strcmp(key, "audiocodecid") && acodec) flv_set_audio_codec(s, astream, (int)num_val << FLV_AUDIO_CODECID_OFFSET); + else if(!strcmp(key, "videocodecid") && vcodec) flv_set_video_codec(s, vstream, (int)num_val); + else if(!strcmp(key, "audiosamplesize") && acodec && num_val >= 0) { + acodec->bits_per_sample = num_val; + //we may have to rewrite a previously read codecid because FLV only marks PCM endianness. + if(num_val == 8 && (acodec->codec_id == CODEC_ID_PCM_S16BE || acodec->codec_id == CODEC_ID_PCM_S16LE)) + acodec->codec_id = CODEC_ID_PCM_S8; + } + else if(!strcmp(key, "audiosamplerate") && acodec && num_val >= 0) { + //some tools, like FLVTool2, write consistently approximate metadata sample rates + switch((int)num_val) { + case 44000: acodec->sample_rate = 44100 ; break; + case 22000: acodec->sample_rate = 22050 ; break; + case 11000: acodec->sample_rate = 11025 ; break; + case 5000 : acodec->sample_rate = 5512 ; break; + default : acodec->sample_rate = num_val; + } + } + } + } + + return 0; +} + +static int flv_read_metabody(AVFormatContext *s, unsigned int next_pos) { + AMFDataType type; + AVStream *stream, *astream, *vstream; + ByteIOContext *ioc; + int i, keylen; + char buffer[11]; //only needs to hold the string "onMetaData". Anything longer is something we don't want. + + astream = NULL; + vstream = NULL; + keylen = 0; + ioc = &s->pb; + + //first object needs to be "onMetaData" string + type = get_byte(ioc); + if(type != AMF_DATA_TYPE_STRING || amf_get_string(ioc, buffer, sizeof(buffer)) < 0 || 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 == CODEC_TYPE_AUDIO) astream = stream; + else if(stream->codec->codec_type == CODEC_TYPE_VIDEO) vstream = 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, + AVFormatParameters *ap) +{ + int offset, flags; + AVStream *st; + + url_fskip(&s->pb, 4); + flags = get_byte(&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"); + } + + if(flags & FLV_HEADER_FLAG_HASVIDEO){ + st = av_new_stream(s, 0); + if (!st) + return AVERROR_NOMEM; + st->codec->codec_type = CODEC_TYPE_VIDEO; + av_set_pts_info(st, 24, 1, 1000); /* 24 bit pts in ms */ + } + if(flags & FLV_HEADER_FLAG_HASAUDIO){ + st = av_new_stream(s, 1); + if (!st) + return AVERROR_NOMEM; + st->codec->codec_type = CODEC_TYPE_AUDIO; + av_set_pts_info(st, 24, 1, 1000); /* 24 bit pts in ms */ + } + + offset = get_be32(&s->pb); + url_fseek(&s->pb, offset, SEEK_SET); + + s->start_time = 0; + + return 0; +} + +static int flv_read_packet(AVFormatContext *s, AVPacket *pkt) +{ + int ret, i, type, size, pts, flags, is_audio, next, pos; + AVStream *st = NULL; + + for(;;){ + pos = url_ftell(&s->pb); + url_fskip(&s->pb, 4); /* size of previous packet */ + type = get_byte(&s->pb); + size = get_be24(&s->pb); + pts = get_be24(&s->pb); +// av_log(s, AV_LOG_DEBUG, "type:%d, size:%d, pts:%d\n", type, size, pts); + if (url_feof(&s->pb)) + return AVERROR_IO; + url_fskip(&s->pb, 4); /* reserved */ + flags = 0; + + if(size == 0) + continue; + + next= size + url_ftell(&s->pb); + + if (type == FLV_TAG_TYPE_AUDIO) { + is_audio=1; + flags = get_byte(&s->pb); + } else if (type == FLV_TAG_TYPE_VIDEO) { + is_audio=0; + flags = get_byte(&s->pb); + } else { + if (type == FLV_TAG_TYPE_META && size > 13+1+4) + flv_read_metabody(s, next); + else /* skip packet */ + av_log(s, AV_LOG_ERROR, "skipping flv packet: type %d, size %d, flags %d\n", type, size, flags); + url_fseek(&s->pb, next, SEEK_SET); + continue; + } + + /* now find stream */ + for(i=0;i<s->nb_streams;i++) { + st = s->streams[i]; + if (st->id == is_audio) + break; + } + if(i == s->nb_streams){ + av_log(NULL, AV_LOG_ERROR, "invalid stream\n"); + url_fseek(&s->pb, next, SEEK_SET); + continue; + } +// av_log(NULL, AV_LOG_DEBUG, "%d %X %d \n", is_audio, flags, st->discard); + if( (st->discard >= AVDISCARD_NONKEY && !((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY || is_audio)) + ||(st->discard >= AVDISCARD_BIDIR && ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_DISP_INTER && !is_audio)) + || st->discard >= AVDISCARD_ALL + ){ + url_fseek(&s->pb, next, SEEK_SET); + continue; + } + if ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY) + av_add_index_entry(st, pos, pts, 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(!url_is_streamed(&s->pb) && s->duration==AV_NOPTS_VALUE){ + int size; + const int pos= url_ftell(&s->pb); + const int fsize= url_fsize(&s->pb); + url_fseek(&s->pb, fsize-4, SEEK_SET); + size= get_be32(&s->pb); + url_fseek(&s->pb, fsize-3-size, SEEK_SET); + if(size == get_be24(&s->pb) + 11){ + s->duration= get_be24(&s->pb) * (int64_t)AV_TIME_BASE / 1000; + } + url_fseek(&s->pb, pos, SEEK_SET); + } + + if(is_audio){ + if(!st->codec->sample_rate || !st->codec->bits_per_sample || (!st->codec->codec_id && !st->codec->codec_tag)) { + st->codec->channels = (flags & FLV_AUDIO_CHANNEL_MASK) == FLV_STEREO ? 2 : 1; + if((flags & FLV_AUDIO_CODECID_MASK) == FLV_CODECID_NELLYMOSER_8HZ_MONO) + st->codec->sample_rate= 8000; + else + st->codec->sample_rate = (44100 << ((flags & FLV_AUDIO_SAMPLERATE_MASK) >> FLV_AUDIO_SAMPLERATE_OFFSET) >> 3); + st->codec->bits_per_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8; + flv_set_audio_codec(s, st, flags & FLV_AUDIO_CODECID_MASK); + } + }else{ + size -= flv_set_video_codec(s, st, flags & FLV_VIDEO_CODECID_MASK); + } + + ret= av_get_packet(&s->pb, pkt, size - 1); + if (ret <= 0) { + return AVERROR_IO; + } + /* note: we need to modify the packet size here to handle the last + packet */ + pkt->size = ret; + pkt->pts = pts; + pkt->stream_index = st->index; + + if (is_audio || ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY)) + pkt->flags |= PKT_FLAG_KEY; + + return ret; +} + +static int flv_read_close(AVFormatContext *s) +{ + return 0; +} + +static int flv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) +{ + AVStream *st = s->streams[stream_index]; + int index = av_index_search_timestamp(st, timestamp, flags); + if (index < 0) + return -1; + url_fseek(&s->pb, st->index_entries[index].pos, SEEK_SET); + + return 0; +} + +AVInputFormat flv_demuxer = { + "flv", + "flv format", + 0, + flv_probe, + flv_read_header, + flv_read_packet, + flv_read_close, + flv_read_seek, + .extensions = "flv", + .value = CODEC_ID_FLV1, +}; |