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X-BeenThere: ffmpeg-devel@ffmpeg.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: FFmpeg development discussions and patches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: FFmpeg development discussions and patches Cc: Rashad Tatum Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" Archived-At: List-Archive: List-Post: Add implementation for changing the play rate for rtsp streams. --- libavformat/avformat.h | 6 ++++++ libavformat/demux.h | 6 ++++++ libavformat/demux_utils.c | 6 ++++++ libavformat/rtsp.c | 1 + libavformat/rtsp.h | 10 ++++++++++ libavformat/rtspdec.c | 21 +++++++++++++++++++-- 6 files changed, 48 insertions(+), 2 deletions(-) diff --git a/libavformat/avformat.h b/libavformat/avformat.h index 2034d2aecc..7819b61d3e 100644 --- a/libavformat/avformat.h +++ b/libavformat/avformat.h @@ -2358,6 +2358,12 @@ int avformat_flush(AVFormatContext *s); */ int av_read_play(AVFormatContext *s); +/** + * Play a network-based stream (e.g. RTSP stream) with a given play rate + * (e.g. Scale value for RTSP) and timestamp position. + */ +int av_read_play_with_rate(AVFormatContext *s, double play_rate, int stream_index, int64_t timestamp); + /** * Pause a network-based stream (e.g. RTSP stream). * diff --git a/libavformat/demux.h b/libavformat/demux.h index e83d84a201..965743bdf0 100644 --- a/libavformat/demux.h +++ b/libavformat/demux.h @@ -113,6 +113,12 @@ typedef struct FFInputFormat { * (RTSP). */ int (*read_play)(struct AVFormatContext *); + + /** + * Play a network-based stream (e.g. RTSP stream) with a given play rate + * (e.g. Scale value for RTSP) and timestamp position. + */ + int (*read_play_with_rate)(struct AVFormatContext *s, double play_rate, int stream_index, int64_t timestamp); /** * Pause playing - only meaningful if using a network-based format diff --git a/libavformat/demux_utils.c b/libavformat/demux_utils.c index b632277460..8fed41e3b6 100644 --- a/libavformat/demux_utils.c +++ b/libavformat/demux_utils.c @@ -179,6 +179,12 @@ int av_read_play(AVFormatContext *s) return AVERROR(ENOSYS); } +int av_read_play_with_rate(AVFormatContext *s, double play_rate, int stream_index, int64_t timestamp) { + if (ffifmt(s->iformat)->read_play_with_rate) + return ffifmt(s->iformat)->read_play_with_rate(s, play_rate, stream_index, timestamp); + return AVERROR(ENOSYS); +} + int av_read_pause(AVFormatContext *s) { if (ffifmt(s->iformat)->read_pause) diff --git a/libavformat/rtsp.c b/libavformat/rtsp.c index 5ea471b40c..6cfbcdf989 100644 --- a/libavformat/rtsp.c +++ b/libavformat/rtsp.c @@ -1998,6 +1998,7 @@ redirect: av_strlcpy(rt->real_challenge, real_challenge, sizeof(rt->real_challenge)); rt->state = RTSP_STATE_IDLE; rt->seek_timestamp = 0; /* default is to start stream at position zero */ + rt->scale = 1.0; /* default is to play at the normal rate */ return 0; fail: ff_rtsp_close_streams(s); diff --git a/libavformat/rtsp.h b/libavformat/rtsp.h index 83b2e3f4fb..1b8ce05d74 100644 --- a/libavformat/rtsp.h +++ b/libavformat/rtsp.h @@ -245,6 +245,16 @@ typedef struct RTSPState { * whenever we resume playback. Either way, the value is only used once, * see rtsp_read_play() and rtsp_read_seek(). */ int64_t seek_timestamp; + + /** the scale value requested when calling av_read_play(). This value + * is subsequently used as part of the "Scale" parameter when emitting + * the RTSP PLAY command. The "Scale" parameter determines the stream play + * rate. A value of 1 represents the normal play rate. Any other value is + * in regards to the normal play rate. A negative value represents reverse + * playback. If we are currently playing, this command is called instantly. + * If we are currently paused, this command is called whenever we resume + * playback. */ + double scale; int seq; /**< RTSP command sequence number */ diff --git a/libavformat/rtspdec.c b/libavformat/rtspdec.c index 10078ce2fa..6ba0f8c7d7 100644 --- a/libavformat/rtspdec.c +++ b/libavformat/rtspdec.c @@ -39,6 +39,7 @@ #include "tls.h" #include "url.h" #include "version.h" +#include static const struct RTSPStatusMessage { enum RTSPStatusCode code; @@ -527,7 +528,7 @@ static int rtsp_read_play(AVFormatContext *s) { RTSPState *rt = s->priv_data; RTSPMessageHeader reply1, *reply = &reply1; - int i; + int i, cmd_char_count = 0; char cmd[MAX_URL_SIZE]; av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state); @@ -564,11 +565,17 @@ static int rtsp_read_play(AVFormatContext *s) if (rt->state == RTSP_STATE_PAUSED) { cmd[0] = 0; } else { - snprintf(cmd, sizeof(cmd), + + cmd_char_count += snprintf(cmd, sizeof(cmd), "Range: npt=%"PRId64".%03"PRId64"-\r\n", rt->seek_timestamp / AV_TIME_BASE, rt->seek_timestamp / (AV_TIME_BASE / 1000) % 1000); + + snprintf(cmd + cmd_char_count, sizeof(cmd) - cmd_char_count, "Scale: %f\r\n", rt->scale); + } + + ff_rtsp_send_cmd(s, "PLAY", rt->control_uri, cmd, reply, NULL); if (reply->status_code != RTSP_STATUS_OK) { return ff_rtsp_averror(reply->status_code, -1); @@ -593,6 +600,15 @@ static int rtsp_read_play(AVFormatContext *s) return 0; } +static int rtsp_read_play_with_rate(AVFormatContext *s, int stream_index, double play_rate, int64_t timestamp) { + RTSPState *rt = s->priv_data; + rt->seek_timestamp = av_rescale_q(timestamp, + s->streams[stream_index]->time_base, + AV_TIME_BASE_Q); + rt->scale = play_rate; + return rtsp_read_play(s); +} + /* pause the stream */ static int rtsp_read_pause(AVFormatContext *s) { @@ -1006,5 +1022,6 @@ const FFInputFormat ff_rtsp_demuxer = { .read_close = rtsp_read_close, .read_seek = rtsp_read_seek, .read_play = rtsp_read_play, + .read_play_with_rate = rtsp_read_play_with_rate, .read_pause = rtsp_read_pause, }; -- 2.49.0 _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".