diff options
Diffstat (limited to 'libavformat/flvdec.c')
-rw-r--r-- | libavformat/flvdec.c | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/libavformat/flvdec.c b/libavformat/flvdec.c index e3449a6..697f8ed 100644 --- a/libavformat/flvdec.c +++ b/libavformat/flvdec.c @@ -31,6 +31,10 @@ #include "avio_internal.h" #include "flv.h" +#define KEYFRAMES_TAG "keyframes" +#define KEYFRAMES_TIMESTAMP_TAG "times" +#define KEYFRAMES_BYTEOFFSET_TAG "filepositions" + typedef struct { int wrong_dts; ///< wrong dts due to negative cts } FLVContext; @@ -125,6 +129,64 @@ static int amf_get_string(AVIOContext *ioc, char *buffer, int buffsize) { return length; } +static int parse_keyframes_index(AVFormatContext *s, AVIOContext *ioc, AVStream *vstream, int64_t max_pos) { + unsigned int arraylen = 0, timeslen = 0, fileposlen = 0, i; + double num_val; + char str_val[256]; + int64_t *times = NULL; + int64_t *filepositions = NULL; + int ret = 0; + + while (avio_tell(ioc) < max_pos - 2 && amf_get_string(ioc, str_val, sizeof(str_val)) > 0) { + int64_t* current_array; + + // Expect array object in context + if (avio_r8(ioc) != AMF_DATA_TYPE_ARRAY) + break; + + arraylen = avio_rb32(ioc); + /* + * Expect only 'times' or 'filepositions' sub-arrays in other case refuse to use such metadata + * for indexing + */ + if (!strcmp(KEYFRAMES_TIMESTAMP_TAG, str_val) && !times) { + if (!(times = av_mallocz(sizeof(*times) * arraylen))) { + ret = AVERROR(ENOMEM); + goto finish; + } + timeslen = arraylen; + current_array = times; + } else if (!strcmp(KEYFRAMES_BYTEOFFSET_TAG, str_val) && !filepositions) { + if (!(filepositions = av_mallocz(sizeof(*filepositions) * arraylen))) { + ret = AVERROR(ENOMEM); + goto finish; + } + fileposlen = arraylen; + current_array = filepositions; + } else // unexpected metatag inside keyframes, will not use such metadata for indexing + break; + + for (i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++) { + if (avio_r8(ioc) != AMF_DATA_TYPE_NUMBER) + goto finish; + num_val = av_int2dbl(avio_rb64(ioc)); + current_array[i] = num_val; + } + } + + if (timeslen == fileposlen) + for(i = 0; i < arraylen; i++) + av_add_index_entry(vstream, filepositions[i], times[i]*1000, 0, 0, AVINDEX_KEYFRAME); + else + av_log(s, AV_LOG_WARNING, "Invalid keyframes object, skipping.\n"); + +finish: + av_freep(×); + av_freep(&filepositions); + avio_seek(ioc, max_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; AVIOContext *ioc; @@ -149,6 +211,10 @@ static int amf_parse_object(AVFormatContext *s, AVStream *astream, AVStream *vst case AMF_DATA_TYPE_OBJECT: { unsigned int keylen; + if (!strcmp(KEYFRAMES_TAG, key) && depth == 1) + if (parse_keyframes_index(s, ioc, vstream, max_pos) < 0) + return -1; + while(avio_tell(ioc) < max_pos - 2 && (keylen = avio_rb16(ioc))) { avio_skip(ioc, keylen); //skip key string if(amf_parse_object(s, NULL, NULL, NULL, max_pos, depth + 1) < 0) |