+ 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:
+ acodec->codec_id = acodec->bits_per_coded_sample == 8 ? CODEC_ID_PCM_S8 :
+#ifdef WORDS_BIGENDIAN
+ CODEC_ID_PCM_S16BE;
+#else
+ CODEC_ID_PCM_S16LE;
+#endif
+ break;
+ case FLV_CODECID_PCM_LE:
+ acodec->codec_id = acodec->bits_per_coded_sample == 8 ? CODEC_ID_PCM_S8 : CODEC_ID_PCM_S16LE; break;
+ case FLV_CODECID_AAC : acodec->codec_id = CODEC_ID_AAC; break;
+ case FLV_CODECID_ADPCM: acodec->codec_id = CODEC_ID_ADPCM_SWF; break;
+ case FLV_CODECID_SPEEX:
+ acodec->codec_id = CODEC_ID_SPEEX;
+ acodec->sample_rate = 16000;
+ break;
+ case FLV_CODECID_MP3 : acodec->codec_id = 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
+ case FLV_CODECID_NELLYMOSER:
+ acodec->codec_id = CODEC_ID_NELLYMOSER;
+ 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_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 ;
+ case FLV_CODECID_VP6A :
+ if(flv_codecid == FLV_CODECID_VP6A)
+ vcodec->codec_id = CODEC_ID_VP6A;
+ 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()
+ case FLV_CODECID_H264:
+ vcodec->codec_id = CODEC_ID_H264;
+ return 3; // not 4, reading packet type will consume one byte
+ 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, int64_t 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, "videodatarate") && vcodec && 0 <= (int)(num_val * 1024.0))
+ vcodec->bit_rate = num_val * 1024.0;
+ else if(!strcmp(key, "audiocodecid") && acodec && 0 <= (int)num_val)
+ flv_set_audio_codec(s, astream, (int)num_val << FLV_AUDIO_CODECID_OFFSET);
+ else if(!strcmp(key, "videocodecid") && vcodec && 0 <= (int)num_val)
+ flv_set_video_codec(s, vstream, (int)num_val);
+ else if(!strcmp(key, "audiosamplesize") && acodec && 0 < (int)num_val) {
+ acodec->bits_per_coded_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
+ if (!acodec->sample_rate) {
+ 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;
+ }
+ }
+ }
+ }