diff --git a/libavformat/avformat.h b/libavformat/avformat.h index f3a89fdf4b..07fa7f1e5a 100644 --- a/libavformat/avformat.h +++ b/libavformat/avformat.h @@ -5,7 +5,7 @@ extern "C" { #endif -#define LIBAVFORMAT_BUILD 4609 +#define LIBAVFORMAT_BUILD 4610 #define LIBAVFORMAT_VERSION_INT FFMPEG_VERSION_INT #define LIBAVFORMAT_VERSION FFMPEG_VERSION @@ -31,12 +31,15 @@ extern "C" { #define AV_TIME_BASE 1000000 typedef struct AVPacket { - int64_t pts; /* presentation time stamp in stream units (set av_set_pts_info) */ + int64_t pts; /* presentation time stamp in AV_TIME_BASE units (or + pts_den units in muxers or demuxers) */ + int64_t dts; /* decompression time stamp in AV_TIME_BASE units (or + pts_den units in muxers or demuxers) */ uint8_t *data; int size; int stream_index; int flags; - int duration; + int duration; /* presentation duration (0 if not available) */ void (*destruct)(struct AVPacket *); void *priv; } AVPacket; @@ -46,11 +49,14 @@ typedef struct AVPacket { static inline void av_init_packet(AVPacket *pkt) { pkt->pts = AV_NOPTS_VALUE; + pkt->dts = AV_NOPTS_VALUE; + pkt->duration = 0; pkt->flags = 0; pkt->stream_index = 0; } int av_new_packet(AVPacket *pkt, int size); +int av_dup_packet(AVPacket *pkt); /** * Free a packet @@ -107,6 +113,8 @@ typedef struct AVFormatParameters { int mpeg2ts_compute_pcr:1; /* compute exact PCR for each transport stream packet (only meaningful if mpeg2ts_raw is TRUE */ + int initial_pause:1; /* do not begin to play the stream + immediately (RTSP only) */ } AVFormatParameters; #define AVFMT_NOFILE 0x0001 /* no file should be opened */ @@ -158,9 +166,10 @@ typedef struct AVInputFormat { /* close the stream. The AVFormatContext and AVStreams are not freed by this function */ int (*read_close)(struct AVFormatContext *); - /* seek at or before a given pts (given in microsecond). The pts - origin is defined by the stream */ - int (*read_seek)(struct AVFormatContext *, int64_t pts); + /* seek at or before a given timestamp (given in AV_TIME_BASE + units) relative to the frames in stream component stream_index */ + int (*read_seek)(struct AVFormatContext *, + int stream_index, int64_t timestamp); /* can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER */ int flags; /* if extensions are defined, then no probe is done. You should @@ -169,10 +178,26 @@ typedef struct AVInputFormat { const char *extensions; /* general purpose read only value that the format can use */ int value; + + /* start/resume playing - only meaningful if using a network based format + (RTSP) */ + int (*read_play)(struct AVFormatContext *); + + /* pause playing - only meaningful if using a network based format + (RTSP) */ + int (*read_pause)(struct AVFormatContext *); + /* private fields */ struct AVInputFormat *next; } AVInputFormat; +typedef struct AVIndexEntry { + int64_t pos; + int64_t timestamp; +#define AVINDEX_KEYFRAME 0x0001 + int flags; +} AVIndexEntry; + typedef struct AVStream { int index; /* stream index in AVFormatContext */ int id; /* format specific stream id */ @@ -181,9 +206,8 @@ typedef struct AVStream { int r_frame_rate_base;/* real frame rate base of the stream */ void *priv_data; /* internal data used in av_find_stream_info() */ - int codec_info_state; - int codec_info_nb_repeat_frames; - int codec_info_nb_real_frames; + int64_t codec_info_duration; + int codec_info_nb_frames; /* encoding: PTS generation when outputing stream */ AVFrac pts; /* ffmpeg.c private use */ @@ -197,6 +221,20 @@ typedef struct AVStream { /* decoding: duration of the stream, in AV_TIME_BASE fractional seconds. */ int64_t duration; + + /* av_read_frame() support */ + int need_parsing; + struct AVCodecParserContext *parser; + int got_frame; + int64_t cur_frame_pts; + int64_t cur_frame_dts; + int64_t cur_dts; + int last_IP_duration; + /* av_seek_frame() support */ + AVIndexEntry *index_entries; /* only used if the format does not + support seeking natively */ + int nb_index_entries; + int index_entries_allocated_size; } AVStream; #define AVFMTCTX_NOHEADER 0x0001 /* signal that no header is present @@ -247,6 +285,24 @@ typedef struct AVFormatContext { available. Never set it directly if the file_size and the duration are known as ffmpeg can compute it automatically. */ int bit_rate; + + /* av_read_frame() support */ + AVStream *cur_st; + const uint8_t *cur_ptr; + int cur_len; + AVPacket cur_pkt; + + /* the following are used for pts/dts unit conversion */ + int64_t last_pkt_stream_pts; + int64_t last_pkt_stream_dts; + int64_t last_pkt_pts; + int64_t last_pkt_dts; + int last_pkt_pts_frac; + int last_pkt_dts_frac; + + /* av_seek_frame() support */ + int64_t data_offset; /* offset of the first packet */ + int index_built; } AVFormatContext; typedef struct AVPacketList { @@ -373,6 +429,8 @@ int amr_init(void); int wav_init(void); /* raw.c */ +int pcm_read_seek(AVFormatContext *s, + int stream_index, int64_t timestamp); int raw_init(void); /* mp3.c */ @@ -436,7 +494,8 @@ AVOutputFormat *guess_stream_format(const char *short_name, AVOutputFormat *guess_format(const char *short_name, const char *filename, const char *mime_type); -void av_hex_dump(uint8_t *buf, int size); +void av_hex_dump(FILE *f, uint8_t *buf, int size); +void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload); void av_register_all(void); @@ -468,9 +527,14 @@ int av_open_input_file(AVFormatContext **ic_ptr, const char *filename, #define AVERROR_INVALIDDATA (-4) /* invalid data found */ #define AVERROR_NOMEM (-5) /* not enough memory */ #define AVERROR_NOFMT (-6) /* unknown format */ - +#define AVERROR_NOTSUPP (-7) /* operation not supported */ + int av_find_stream_info(AVFormatContext *ic); int av_read_packet(AVFormatContext *s, AVPacket *pkt); +int av_read_frame(AVFormatContext *s, AVPacket *pkt); +int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp); +int av_read_play(AVFormatContext *s); +int av_read_pause(AVFormatContext *s); void av_close_input_file(AVFormatContext *s); AVStream *av_new_stream(AVFormatContext *s, int id); void av_set_pts_info(AVFormatContext *s, int pts_wrap_bits, diff --git a/libavformat/utils.c b/libavformat/utils.c index ddd26f1b7d..036c384bea 100644 --- a/libavformat/utils.c +++ b/libavformat/utils.c @@ -161,6 +161,24 @@ int av_new_packet(AVPacket *pkt, int size) return 0; } +/* This is a hack - the packet memory allocation stuff is broken. The + packet is allocated if it was not really allocated */ +int av_dup_packet(AVPacket *pkt) +{ + if (pkt->destruct != av_destruct_packet) { + uint8_t *data; + /* we duplicate the packet */ + data = av_malloc(pkt->size); + if (!data) { + return AVERROR_NOMEM; + } + memcpy(data, pkt->data, pkt->size); + pkt->data = data; + pkt->destruct = av_destruct_packet; + } + return 0; +} + /* fifo handling */ int fifo_init(FifoBuffer *f, int size) @@ -309,10 +327,18 @@ int av_open_input_stream(AVFormatContext **ic_ptr, /* default pts settings is MPEG like */ av_set_pts_info(ic, 33, 1, 90000); - + ic->last_pkt_pts = AV_NOPTS_VALUE; + ic->last_pkt_dts = AV_NOPTS_VALUE; + ic->last_pkt_stream_pts = AV_NOPTS_VALUE; + ic->last_pkt_stream_dts = AV_NOPTS_VALUE; + err = ic->iformat->read_header(ic, ap); if (err < 0) goto fail; + + if (pb) + ic->data_offset = url_ftell(&ic->pb); + *ic_ptr = ic; return 0; fail: @@ -425,14 +451,324 @@ int av_open_input_file(AVFormatContext **ic_ptr, const char *filename, /*******************************************************/ /** - * Read a packet from a media file. Use it only for low level file - * reading. It is almost always better to use av_read_frame(). + * Read a transport packet from a media file. This function is + * absolete and should never be used. Use av_read_frame() instead. * * @param s media file handle * @param pkt is filled * @return 0 if OK. AVERROR_xxx if error. */ int av_read_packet(AVFormatContext *s, AVPacket *pkt) +{ + return s->iformat->read_packet(s, pkt); +} + +/**********************************************************/ + +/* convert the packet time stamp units and handle wrapping. The + wrapping is handled by considering the next PTS/DTS as a delta to + the previous value. We handle the delta as a fraction to avoid any + rounding errors. */ +static inline int64_t convert_timestamp_units(AVFormatContext *s, + int64_t *plast_pkt_pts, + int *plast_pkt_pts_frac, + int64_t *plast_pkt_stream_pts, + int64_t pts) +{ + int64_t stream_pts; + int64_t delta_pts; + int shift, pts_frac; + + if (pts != AV_NOPTS_VALUE) { + stream_pts = pts; + if (*plast_pkt_stream_pts != AV_NOPTS_VALUE) { + shift = 64 - s->pts_wrap_bits; + delta_pts = ((stream_pts - *plast_pkt_stream_pts) << shift) >> shift; + /* XXX: overflow possible but very unlikely as it is a delta */ + delta_pts = delta_pts * AV_TIME_BASE * s->pts_num; + pts = *plast_pkt_pts + (delta_pts / s->pts_den); + pts_frac = *plast_pkt_pts_frac + (delta_pts % s->pts_den); + if (pts_frac >= s->pts_den) { + pts_frac -= s->pts_den; + pts++; + } + } else { + /* no previous pts, so no wrapping possible */ + pts = (int64_t)(((double)stream_pts * AV_TIME_BASE * s->pts_num) / + (double)s->pts_den); + pts_frac = 0; + } + *plast_pkt_stream_pts = stream_pts; + *plast_pkt_pts = pts; + *plast_pkt_pts_frac = pts_frac; + } + return pts; +} + +/* get the number of samples of an audio frame. Return (-1) if error */ +static int get_audio_frame_size(AVCodecContext *enc, int size) +{ + int frame_size; + + if (enc->frame_size <= 1) { + /* specific hack for pcm codecs because no frame size is + provided */ + switch(enc->codec_id) { + case CODEC_ID_PCM_S16LE: + case CODEC_ID_PCM_S16BE: + case CODEC_ID_PCM_U16LE: + case CODEC_ID_PCM_U16BE: + if (enc->channels == 0) + return -1; + frame_size = size / (2 * enc->channels); + break; + case CODEC_ID_PCM_S8: + case CODEC_ID_PCM_U8: + case CODEC_ID_PCM_MULAW: + case CODEC_ID_PCM_ALAW: + if (enc->channels == 0) + return -1; + frame_size = size / (enc->channels); + break; + default: + /* used for example by ADPCM codecs */ + if (enc->bit_rate == 0) + return -1; + frame_size = (size * 8 * enc->sample_rate) / enc->bit_rate; + break; + } + } else { + frame_size = enc->frame_size; + } + return frame_size; +} + + +/* return the frame duration in seconds, return 0 if not available */ +static void compute_frame_duration(int *pnum, int *pden, + AVFormatContext *s, AVStream *st, + AVCodecParserContext *pc, AVPacket *pkt) +{ + int frame_size; + + *pnum = 0; + *pden = 0; + switch(st->codec.codec_type) { + case CODEC_TYPE_VIDEO: + *pnum = st->codec.frame_rate_base; + *pden = st->codec.frame_rate; + if (pc && pc->repeat_pict) { + *pden *= 2; + *pnum = (*pnum) * (2 + pc->repeat_pict); + } + break; + case CODEC_TYPE_AUDIO: + frame_size = get_audio_frame_size(&st->codec, pkt->size); + if (frame_size < 0) + break; + *pnum = frame_size; + *pden = st->codec.sample_rate; + break; + default: + break; + } +} + +static void compute_pkt_fields(AVFormatContext *s, AVStream *st, + AVCodecParserContext *pc, AVPacket *pkt) +{ + int num, den, presentation_delayed; + + if (pkt->duration == 0) { + compute_frame_duration(&num, &den, s, st, pc, pkt); + if (den && num) { + pkt->duration = (num * (int64_t)AV_TIME_BASE) / den; + } + } + + /* do we have a video B frame ? */ + presentation_delayed = 0; + if (st->codec.codec_type == CODEC_TYPE_VIDEO) { + /* XXX: need has_b_frame, but cannot get it if the codec is + not initialized */ + if ((st->codec.codec_id == CODEC_ID_MPEG1VIDEO || + st->codec.codec_id == CODEC_ID_MPEG2VIDEO || + st->codec.codec_id == CODEC_ID_MPEG4 || + st->codec.codec_id == CODEC_ID_H264) && + pc && pc->pict_type != FF_B_TYPE) + presentation_delayed = 1; + } + + /* interpolate PTS and DTS if they are not present */ + if (presentation_delayed) { + /* DTS = decompression time stamp */ + /* PTS = presentation time stamp */ + if (pkt->dts == AV_NOPTS_VALUE) { + pkt->dts = st->cur_dts; + } else { + st->cur_dts = pkt->dts; + } + /* this is tricky: the dts must be incremented by the duration + of the frame we are displaying, i.e. the last I or P frame */ + if (st->last_IP_duration == 0) + st->cur_dts += pkt->duration; + else + st->cur_dts += st->last_IP_duration; + st->last_IP_duration = pkt->duration; + /* cannot compute PTS if not present (we can compute it only + by knowing the futur */ + } else { + /* presentation is not delayed : PTS and DTS are the same */ + if (pkt->pts == AV_NOPTS_VALUE) { + pkt->pts = st->cur_dts; + pkt->dts = st->cur_dts; + } else { + st->cur_dts = pkt->pts; + pkt->dts = pkt->pts; + } + st->cur_dts += pkt->duration; + } + + /* update flags */ + if (pc) { + pkt->flags = 0; + /* key frame computation */ + switch(st->codec.codec_type) { + case CODEC_TYPE_VIDEO: + if (pc->pict_type == FF_I_TYPE) + pkt->flags |= PKT_FLAG_KEY; + break; + case CODEC_TYPE_AUDIO: + pkt->flags |= PKT_FLAG_KEY; + break; + default: + break; + } + } + +} + +static void av_destruct_packet_nofree(AVPacket *pkt) +{ + pkt->data = NULL; pkt->size = 0; +} + +static int av_read_frame_internal(AVFormatContext *s, AVPacket *pkt) +{ + AVStream *st; + int len, ret; + + for(;;) { + /* select current input stream component */ + st = s->cur_st; + if (st) { + if (!st->parser) { + /* no parsing needed: we just output the packet as is */ + /* raw data support */ + *pkt = s->cur_pkt; + compute_pkt_fields(s, st, NULL, pkt); + s->cur_st = NULL; + return 0; + } else if (s->cur_len > 0) { + /* we use the MPEG semantics: the pts and dts in a + packet are given from the first frame beginning in + it */ + if (!st->got_frame) { + st->cur_frame_pts = s->cur_pkt.pts; + st->cur_frame_dts = s->cur_pkt.dts; + s->cur_pkt.pts = AV_NOPTS_VALUE; + s->cur_pkt.dts = AV_NOPTS_VALUE; + st->got_frame = 1; + } + len = av_parser_parse(st->parser, &st->codec, &pkt->data, &pkt->size, + s->cur_ptr, s->cur_len); + /* increment read pointer */ + s->cur_ptr += len; + s->cur_len -= len; + + /* return packet if any */ + if (pkt->size) { + pkt->duration = 0; + pkt->stream_index = st->index; + pkt->pts = st->cur_frame_pts; + pkt->dts = st->cur_frame_dts; + pkt->destruct = av_destruct_packet_nofree; + compute_pkt_fields(s, st, st->parser, pkt); + st->got_frame = 0; + return 0; + } + } else { + s->cur_st = NULL; + } + } else { + /* free previous packet */ + if (s->cur_st && s->cur_st->parser) + av_free_packet(&s->cur_pkt); + + /* read next packet */ + ret = av_read_packet(s, &s->cur_pkt); + if (ret < 0) + return ret; + + /* convert the packet time stamp units and handle wrapping */ + s->cur_pkt.pts = convert_timestamp_units(s, + &s->last_pkt_pts, &s->last_pkt_pts_frac, + &s->last_pkt_stream_pts, + s->cur_pkt.pts); + s->cur_pkt.dts = convert_timestamp_units(s, + &s->last_pkt_dts, &s->last_pkt_dts_frac, + &s->last_pkt_stream_dts, + s->cur_pkt.dts); +#if 0 + if (s->cur_pkt.stream_index == 1) { + if (s->cur_pkt.pts != AV_NOPTS_VALUE) + printf("PACKET pts=%0.3f\n", + (double)s->cur_pkt.pts / AV_TIME_BASE); + if (s->cur_pkt.dts != AV_NOPTS_VALUE) + printf("PACKET dts=%0.3f\n", + (double)s->cur_pkt.dts / AV_TIME_BASE); + } +#endif + + /* duration field */ + if (s->cur_pkt.duration != 0) { + s->cur_pkt.duration = ((int64_t)s->cur_pkt.duration * AV_TIME_BASE * s->pts_num) / + s->pts_den; + } + + st = s->streams[s->cur_pkt.stream_index]; + s->cur_st = st; + s->cur_ptr = s->cur_pkt.data; + s->cur_len = s->cur_pkt.size; + if (st->need_parsing && !st->parser) { + st->parser = av_parser_init(st->codec.codec_id); + if (!st->parser) { + /* no parser available : just output the raw packets */ + st->need_parsing = 0; + } + } + } + } +} + +/** + * Return the next frame of a stream. The returned packet is valid + * until the next av_read_frame() or until av_close_input_file() and + * must be freed with av_free_packet. For video, the packet contains + * exactly one frame. For audio, it contains an integer number of + * frames if each frame has a known fixed size (e.g. PCM or ADPCM + * data). If the audio frames have a variable size (e.g. MPEG audio), + * then it contains one frame. + * + * pkt->pts, pkt->dts and pkt->duration are always set to correct + * values in AV_TIME_BASE unit (and guessed if the format cannot + * provided them). pkt->pts can be AV_NOPTS_VALUE if the video format + * has B frames, so it is better to rely on pkt->dts if you do not + * decompress the payload. + * + * Return 0 if OK, < 0 if error or end of file. + */ +int av_read_frame(AVFormatContext *s, AVPacket *pkt) { AVPacketList *pktl; @@ -444,10 +780,201 @@ int av_read_packet(AVFormatContext *s, AVPacket *pkt) av_free(pktl); return 0; } else { - return s->iformat->read_packet(s, pkt); + return av_read_frame_internal(s, pkt); + } +} + +/* XXX: suppress the packet queue */ +static void flush_packet_queue(AVFormatContext *s) +{ + AVPacketList *pktl; + + for(;;) { + pktl = s->packet_buffer; + if (!pktl) + break; + s->packet_buffer = pktl->next; + av_free_packet(&pktl->pkt); + av_free(pktl); } } +/*******************************************************/ +/* seek support */ + +/* flush the frame reader */ +static void av_read_frame_flush(AVFormatContext *s) +{ + AVStream *st; + int i; + + flush_packet_queue(s); + + /* free previous packet */ + if (s->cur_st) { + if (s->cur_st->parser) + av_free_packet(&s->cur_pkt); + s->cur_st = NULL; + } + /* fail safe */ + s->cur_ptr = NULL; + s->cur_len = 0; + + /* for each stream, reset read state */ + for(i = 0; i < s->nb_streams; i++) { + st = s->streams[i]; + + if (st->parser) { + av_parser_close(st->parser); + st->parser = NULL; + } + st->got_frame = 0; + st->cur_dts = 0; /* we set the current DTS to an unspecified origin */ + } +} + +static void add_index_entry(AVStream *st, + int64_t pos, int64_t timestamp, int flags) +{ + AVIndexEntry *entries, *ie; + + entries = av_fast_realloc(st->index_entries, + &st->index_entries_allocated_size, + (st->nb_index_entries + 1) * + sizeof(AVIndexEntry)); + if (entries) { + st->index_entries = entries; + ie = &entries[st->nb_index_entries++]; + ie->pos = pos; + ie->timestamp = timestamp; + ie->flags = flags; + } +} + +/* build an index for raw streams using a parser */ +static void av_build_index_raw(AVFormatContext *s) +{ + AVPacket pkt1, *pkt = &pkt1; + int ret; + AVStream *st; + + st = s->streams[0]; + av_read_frame_flush(s); + url_fseek(&s->pb, s->data_offset, SEEK_SET); + + for(;;) { + ret = av_read_frame(s, pkt); + if (ret < 0) + break; + if (pkt->stream_index == 0 && st->parser && + (pkt->flags & PKT_FLAG_KEY)) { + add_index_entry(st, st->parser->frame_offset, pkt->dts, + AVINDEX_KEYFRAME); + } + av_free_packet(pkt); + } +} + +/* return TRUE if we deal with a raw stream (raw codec data and + parsing needed) */ +static int is_raw_stream(AVFormatContext *s) +{ + AVStream *st; + + if (s->nb_streams != 1) + return 0; + st = s->streams[0]; + if (!st->need_parsing) + return 0; + return 1; +} + +/* return the largest index entry whose timestamp is <= + wanted_timestamp */ +static int index_search_timestamp(AVIndexEntry *entries, + int nb_entries, int wanted_timestamp) +{ + int a, b, m; + int64_t timestamp; + + if (nb_entries <= 0) + return -1; + + a = 0; + b = nb_entries - 1; + while (a <= b) { + m = (a + b) >> 1; + timestamp = entries[m].timestamp; + if (timestamp == wanted_timestamp) + goto found; + else if (timestamp > wanted_timestamp) { + b = m - 1; + } else { + a = m + 1; + } + } + m = a; + if (m > 0) + m--; + found: + return m; +} + +static int av_seek_frame_generic(AVFormatContext *s, + int stream_index, int64_t timestamp) +{ + int index; + AVStream *st; + AVIndexEntry *ie; + + if (!s->index_built) { + if (is_raw_stream(s)) { + av_build_index_raw(s); + } else { + return -1; + } + s->index_built = 1; + } + + if (stream_index < 0) + stream_index = 0; + st = s->streams[stream_index]; + index = index_search_timestamp(st->index_entries, st->nb_index_entries, + timestamp); + if (index < 0) + return -1; + + /* now we have found the index, we can seek */ + ie = &st->index_entries[index]; + av_read_frame_flush(s); + url_fseek(&s->pb, ie->pos, SEEK_SET); + st->cur_dts = ie->timestamp; + return 0; +} + +/** + * Seek to the key frame just before the frame at timestamp + * 'timestamp' in 'stream_index'. If stream_index is (-1), a default + * stream is selected + */ +int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp) +{ + int ret; + + av_read_frame_flush(s); + + /* first, we try the format specific seek */ + if (s->iformat->read_seek) + ret = s->iformat->read_seek(s, stream_index, timestamp); + else + ret = -1; + if (ret >= 0) { + return 0; + } + + return av_seek_frame_generic(s, stream_index, timestamp); +} + /*******************************************************/ /* return TRUE if the stream has accurate timings for at least one component */ @@ -551,20 +1078,6 @@ static void av_estimate_timings_from_bit_rate(AVFormatContext *ic) } } -static void flush_packet_queue(AVFormatContext *s) -{ - AVPacketList *pktl; - - for(;;) { - pktl = s->packet_buffer; - if (!pktl) - break; - s->packet_buffer = pktl->next; - av_free_packet(&pktl->pkt); - av_free(pktl); - } -} - #define DURATION_MAX_READ_SIZE 250000 /* only usable for MPEG-PS streams */ @@ -576,6 +1089,15 @@ static void av_estimate_timings_from_pts(AVFormatContext *ic) int64_t start_time, end_time, end_time1; int64_t filesize, offset, duration; + /* free previous packet */ + if (ic->cur_st && ic->cur_st->parser) + av_free_packet(&ic->cur_pkt); + ic->cur_st = NULL; + + /* flush packet queue */ + flush_packet_queue(ic); + + /* we read the first packets to get the first PTS (not fully accurate, but it is enough now) */ url_fseek(&ic->pb, 0, SEEK_SET); @@ -622,9 +1144,6 @@ static void av_estimate_timings_from_pts(AVFormatContext *ic) if (offset < 0) offset = 0; - /* flush packet queue */ - flush_packet_queue(ic); - url_fseek(&ic->pb, offset, SEEK_SET); read_size = 0; for(;;) { @@ -738,11 +1257,6 @@ static void av_estimate_timings(AVFormatContext *ic) #endif } -/* state for codec information */ -#define CSTATE_NOTFOUND 0 -#define CSTATE_DECODING 1 -#define CSTATE_FOUND 2 - static int has_codec_parameters(AVCodecContext *enc) { int val; @@ -760,6 +1274,46 @@ static int has_codec_parameters(AVCodecContext *enc) return (val != 0); } +static int try_decode_frame(AVStream *st, const uint8_t *data, int size) +{ + int16_t *samples; + AVCodec *codec; + int got_picture, ret; + AVFrame picture; + + codec = avcodec_find_decoder(st->codec.codec_id); + if (!codec) + return -1; + ret = avcodec_open(&st->codec, codec); + if (ret < 0) + return ret; + switch(st->codec.codec_type) { + case CODEC_TYPE_VIDEO: + ret = avcodec_decode_video(&st->codec, &picture, + &got_picture, (uint8_t *)data, size); + break; + case CODEC_TYPE_AUDIO: + samples = av_malloc(AVCODEC_MAX_AUDIO_FRAME_SIZE); + if (!samples) + goto fail; + ret = avcodec_decode_audio(&st->codec, samples, + &got_picture, (uint8_t *)data, size); + av_free(samples); + break; + default: + break; + } + fail: + avcodec_close(&st->codec); + return ret; +} + +/* absolute maximum size we read until we abort */ +#define MAX_READ_SIZE 5000000 + +/* maximum duration until we stop analysing the stream */ +#define MAX_STREAM_DURATION ((int)(AV_TIME_BASE * 1.0)) + /** * Read the beginning of a media file to get stream information. This * is useful for file formats with no headers such as MPEG. This @@ -771,40 +1325,10 @@ static int has_codec_parameters(AVCodecContext *enc) */ int av_find_stream_info(AVFormatContext *ic) { - int i, count, ret, got_picture, size, read_size; - AVCodec *codec; + int i, count, ret, read_size; AVStream *st; - AVPacket *pkt; - AVFrame picture; + AVPacket pkt1, *pkt; AVPacketList *pktl=NULL, **ppktl; - short samples[AVCODEC_MAX_AUDIO_FRAME_SIZE / 2]; - uint8_t *ptr; - int min_read_size, max_read_size; - - /* typical mpeg ts rate is 40 Mbits. DVD rate is about 10 - Mbits. We read at most 0.2 second of file to find all streams */ - - /* XXX: base it on stream bitrate when possible */ - if (ic->iformat == &mpegts_demux) { - /* maximum number of bytes we accept to read to find all the streams - in a file */ - min_read_size = 6000000; - } else { - min_read_size = 250000; - } - /* max read size is 2 seconds of video max */ - max_read_size = min_read_size * 10; - - /* set initial codec state */ - for(i=0;inb_streams;i++) { - st = ic->streams[i]; - if (has_codec_parameters(&st->codec)) - st->codec_info_state = CSTATE_FOUND; - else - st->codec_info_state = CSTATE_NOTFOUND; - st->codec_info_nb_repeat_frames = 0; - st->codec_info_nb_real_frames = 0; - } count = 0; read_size = 0; @@ -813,27 +1337,38 @@ int av_find_stream_info(AVFormatContext *ic) /* check if one codec still needs to be handled */ for(i=0;inb_streams;i++) { st = ic->streams[i]; - if (st->codec_info_state != CSTATE_FOUND) + if (!has_codec_parameters(&st->codec)) break; } if (i == ic->nb_streams) { /* NOTE: if the format has no header, then we need to read some packets to get most of the streams, so we cannot stop here */ - if (!(ic->ctx_flags & AVFMTCTX_NOHEADER) || - read_size >= min_read_size) { + if (!(ic->ctx_flags & AVFMTCTX_NOHEADER)) { /* if we found the info for all the codecs, we can stop */ ret = count; break; } } else { /* we did not get all the codec info, but we read too much data */ - if (read_size >= max_read_size) { + if (read_size >= MAX_READ_SIZE) { ret = count; break; } } + /* NOTE: a new stream can be added there if no header in file + (AVFMTCTX_NOHEADER) */ + ret = av_read_frame_internal(ic, &pkt1); + if (ret < 0) { + /* EOF or error */ + ret = -1; /* we could not have all the codec parameters before EOF */ + if ((ic->ctx_flags & AVFMTCTX_NOHEADER) && + i == ic->nb_streams) + ret = 0; + break; + } + pktl = av_mallocz(sizeof(AVPacketList)); if (!pktl) { ret = AVERROR_NOMEM; @@ -844,116 +1379,68 @@ int av_find_stream_info(AVFormatContext *ic) *ppktl = pktl; ppktl = &pktl->next; - /* NOTE: a new stream can be added there if no header in file - (AVFMTCTX_NOHEADER) */ pkt = &pktl->pkt; - if (ic->iformat->read_packet(ic, pkt) < 0) { - /* EOF or error */ - ret = -1; /* we could not have all the codec parameters before EOF */ - if ((ic->ctx_flags & AVFMTCTX_NOHEADER) && - i == ic->nb_streams) - ret = 0; - break; + *pkt = pkt1; + + /* duplicate the packet */ + if (av_dup_packet(pkt) < 0) { + ret = AVERROR_NOMEM; + break; } - read_size += pkt->size; - /* open new codecs */ - for(i=0;inb_streams;i++) { - st = ic->streams[i]; - if (st->codec_info_state == CSTATE_NOTFOUND) { - /* set to found in case of error */ - st->codec_info_state = CSTATE_FOUND; - codec = avcodec_find_decoder(st->codec.codec_id); - if (codec) { - if(codec->capabilities & CODEC_CAP_TRUNCATED) - st->codec.flags |= CODEC_FLAG_TRUNCATED; - - ret = avcodec_open(&st->codec, codec); - if (ret >= 0) - st->codec_info_state = CSTATE_DECODING; - } - } - } + read_size += pkt->size; st = ic->streams[pkt->stream_index]; - if (st->codec_info_state == CSTATE_DECODING) { - /* decode the data and update codec parameters */ - ptr = pkt->data; - size = pkt->size; - while (size > 0) { - switch(st->codec.codec_type) { - case CODEC_TYPE_VIDEO: - ret = avcodec_decode_video(&st->codec, &picture, - &got_picture, ptr, size); - break; - case CODEC_TYPE_AUDIO: - ret = avcodec_decode_audio(&st->codec, samples, - &got_picture, ptr, size); - break; - default: - ret = -1; - break; - } - if (ret < 0) { - /* if error, simply ignore because another packet - may be OK */ - break; - } - if (got_picture) { - /* we got the parameters - now we can stop - examining this stream */ - /* XXX: add a codec info so that we can decide if - the codec can repeat frames */ - if (st->codec.codec_id == CODEC_ID_MPEG1VIDEO && - ic->iformat != &mpegts_demux && - st->codec.sub_id == 2) { - /* for mpeg2 video, we want to know the real - frame rate, so we decode 40 frames. In mpeg - TS case we do not do it because it would be - too long */ - st->codec_info_nb_real_frames++; - st->codec_info_nb_repeat_frames += st->codec.coded_frame->repeat_pict; -#if 0 - /* XXX: testing */ - if ((st->codec_info_nb_real_frames % 24) == 23) { - st->codec_info_nb_repeat_frames += 2; - } -#endif - /* stop after 40 frames */ - if (st->codec_info_nb_real_frames >= 40) { - av_reduce( - &st->r_frame_rate, - &st->r_frame_rate_base, - (int64_t)st->codec.frame_rate * st->codec_info_nb_real_frames, - (st->codec_info_nb_real_frames + (st->codec_info_nb_repeat_frames >> 1)) * st->codec.frame_rate_base, - 1<<30); - goto close_codec; - } - } else { - close_codec: - st->codec_info_state = CSTATE_FOUND; - avcodec_close(&st->codec); - break; - } - } - ptr += ret; - size -= ret; - } + st->codec_info_duration += pkt->duration; + if (pkt->duration != 0) + st->codec_info_nb_frames++; + + /* if still no information, we try to open the codec and to + decompress the frame. We try to avoid that in most cases as + it takes longer and uses more memory. For MPEG4, we need to + decompress for Quicktime. */ + if (!has_codec_parameters(&st->codec) && + (st->codec.codec_id == CODEC_ID_FLV1 || + st->codec.codec_id == CODEC_ID_H264 || + st->codec.codec_id == CODEC_ID_H263 || + (st->codec.codec_id == CODEC_ID_MPEG4 && !st->need_parsing))) + try_decode_frame(st, pkt->data, pkt->size); + + if (st->codec_info_duration >= MAX_STREAM_DURATION) { + break; } count++; } - /* close each codec if there are opened */ - for(i=0;inb_streams;i++) { - st = ic->streams[i]; - if (st->codec_info_state == CSTATE_DECODING) - avcodec_close(&st->codec); - } - /* set real frame rate info */ for(i=0;inb_streams;i++) { st = ic->streams[i]; if (st->codec.codec_type == CODEC_TYPE_VIDEO) { + /* compute the real frame rate for telecine */ + if ((st->codec.codec_id == CODEC_ID_MPEG1VIDEO || + st->codec.codec_id == CODEC_ID_MPEG2VIDEO) && + st->codec.sub_id == 2) { + if (st->codec_info_nb_frames >= 20) { + float coded_frame_rate, est_frame_rate; + est_frame_rate = ((double)st->codec_info_nb_frames * AV_TIME_BASE) / + (double)st->codec_info_duration ; + coded_frame_rate = (double)st->codec.frame_rate / + (double)st->codec.frame_rate_base; +#if 0 + printf("telecine: coded_frame_rate=%0.3f est_frame_rate=%0.3f\n", + coded_frame_rate, est_frame_rate); +#endif + /* if we detect that it could be a telecine, we + signal it. It would be better to do it at a + higher level as it can change in a film */ + if (coded_frame_rate >= 24.97 && + (est_frame_rate >= 23.5 && est_frame_rate < 24.5)) { + st->r_frame_rate = 24024; + st->r_frame_rate_base = 1001; + } + } + } + /* if no real frame rate, use the codec one */ if (!st->r_frame_rate){ st->r_frame_rate = st->codec.frame_rate; st->r_frame_rate_base = st->codec.frame_rate_base; @@ -961,11 +1448,34 @@ int av_find_stream_info(AVFormatContext *ic) } } - av_estimate_timings(ic); return ret; } +/*******************************************************/ + +/** + * start playing a network based stream (e.g. RTSP stream) at the + * current position + */ +int av_read_play(AVFormatContext *s) +{ + if (!s->iformat->read_play) + return AVERROR_NOTSUPP; + return s->iformat->read_play(s); +} + +/** + * pause a network based stream (e.g. RTSP stream). Use av_read_play() + * to resume it. + */ +int av_read_pause(AVFormatContext *s) +{ + if (!s->iformat->read_pause) + return AVERROR_NOTSUPP; + return s->iformat->read_pause(s); +} + /** * Close a media file (but not its codecs) * @@ -976,24 +1486,22 @@ void av_close_input_file(AVFormatContext *s) int i, must_open_file; AVStream *st; + /* free previous packet */ + if (s->cur_st && s->cur_st->parser) + av_free_packet(&s->cur_pkt); + if (s->iformat->read_close) s->iformat->read_close(s); for(i=0;inb_streams;i++) { /* free all data in a stream component */ st = s->streams[i]; - av_free(st); - } - if (s->packet_buffer) { - AVPacketList *p, *p1; - p = s->packet_buffer; - while (p != NULL) { - p1 = p->next; - av_free_packet(&p->pkt); - av_free(p); - p = p1; + if (st->parser) { + av_parser_close(st->parser); } - s->packet_buffer = NULL; + av_free(st->index_entries); + av_free(st); } + flush_packet_queue(s); must_open_file = 1; if (s->iformat->flags & AVFMT_NOFILE) { must_open_file = 0; @@ -1116,7 +1624,7 @@ int av_write_frame(AVFormatContext *s, int stream_index, const uint8_t *buf, st = s->streams[stream_index]; pts_mask = (1LL << s->pts_wrap_bits) - 1; - ret = s->oformat->write_packet(s, stream_index, (uint8_t *)buf, size, + ret = s->oformat->write_packet(s, stream_index, buf, size, st->pts.val & pts_mask); if (ret < 0) return ret; @@ -1124,24 +1632,11 @@ int av_write_frame(AVFormatContext *s, int stream_index, const uint8_t *buf, /* update pts */ switch (st->codec.codec_type) { case CODEC_TYPE_AUDIO: - if (st->codec.frame_size <= 1) { - frame_size = size / st->codec.channels; - /* specific hack for pcm codecs because no frame size is provided */ - switch(st->codec.codec_id) { - case CODEC_ID_PCM_S16LE: - case CODEC_ID_PCM_S16BE: - case CODEC_ID_PCM_U16LE: - case CODEC_ID_PCM_U16BE: - frame_size >>= 1; - break; - default: - break; - } - } else { - frame_size = st->codec.frame_size; + frame_size = get_audio_frame_size(&st->codec, size); + if (frame_size >= 0) { + av_frac_add(&st->pts, + (int64_t)s->pts_den * frame_size); } - av_frac_add(&st->pts, - (int64_t)s->pts_den * frame_size); break; case CODEC_TYPE_VIDEO: av_frac_add(&st->pts, @@ -1515,12 +2010,12 @@ int get_frame_filename(char *buf, int buf_size, } /** - * - * Print on stdout a nice hexa dump of a buffer + * Print nice hexa dump of a buffer + * @param f stream for output * @param buf buffer * @param size buffer size */ -void av_hex_dump(uint8_t *buf, int size) +void av_hex_dump(FILE *f, uint8_t *buf, int size) { int len, i, j, c; @@ -1528,24 +2023,49 @@ void av_hex_dump(uint8_t *buf, int size) len = size - i; if (len > 16) len = 16; - printf("%08x ", i); + fprintf(f, "%08x ", i); for(j=0;j<16;j++) { if (j < len) - printf(" %02x", buf[i+j]); + fprintf(f, " %02x", buf[i+j]); else - printf(" "); + fprintf(f, " "); } - printf(" "); + fprintf(f, " "); for(j=0;j '~') c = '.'; - printf("%c", c); + fprintf(f, "%c", c); } - printf("\n"); + fprintf(f, "\n"); } } +/** + * Print on 'f' a nice dump of a packet + * @param f stream for output + * @param pkt packet to dump + * @param dump_payload true if the payload must be displayed too + */ +void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload) +{ + fprintf(f, "stream #%d:\n", pkt->stream_index); + fprintf(f, " keyframe=%d\n", ((pkt->flags & PKT_FLAG_KEY) != 0)); + fprintf(f, " duration=%0.3f\n", (double)pkt->duration / AV_TIME_BASE); + /* DTS is _always_ valid */ + fprintf(f, " dts=%0.3f\n", (double)pkt->dts / AV_TIME_BASE); + /* PTS may be not known if B frames are present */ + fprintf(f, " pts="); + if (pkt->pts == AV_NOPTS_VALUE) + fprintf(f, "N/A"); + else + fprintf(f, "%0.3f", (double)pkt->pts / AV_TIME_BASE); + fprintf(f, "\n"); + fprintf(f, " size=%d\n", pkt->size); + if (dump_payload) + av_hex_dump(f, pkt->data, pkt->size); +} + void url_split(char *proto, int proto_size, char *hostname, int hostname_size, int *port_ptr,