webm_dash_manifest: Add option to specify bandwidth

Add an option to webm_dash_manifest demuxer to specify a value for
"bandwidth" field in the DASH manifest. The value is then used by
the muxer. Fixes an existing FIXME in the code.

Signed-off-by: Vignesh Venkatasubramanian <vigneshv@google.com>
Signed-off-by: James Zern <jzern@google.com>

libavformat/matroskadec.c

@@ -364,6 +364,9 @@ typedef struct MatroskaDemuxContext {
 
     /* WebM DASH Manifest live flag/ */
     int is_live;
+
+    /* Bandwidth value for WebM DASH Manifest */
+    int bandwidth;
 } MatroskaDemuxContext;
 
 typedef struct MatroskaBlock {
@@ -3912,7 +3915,20 @@ static int webm_dash_manifest_read_header(AVFormatContext *s)
     av_dict_set_int(&s->streams[0]->metadata, TRACK_NUMBER, tracks[0].num, 0);
 
     // parse the cues and populate Cue related fields
-    return matroska->is_live ? 0 : webm_dash_manifest_cues(s);
+    if (!matroska->is_live) {
+        ret = webm_dash_manifest_cues(s);
+        if (ret < 0) {
+            av_log(s, AV_LOG_ERROR, "Error parsing Cues\n");
+            return ret;
+        }
+    }
+
+    // use the bandwidth from the command line if it was provided
+    if (matroska->bandwidth > 0) {
+        av_dict_set_int(&s->streams[0]->metadata, BANDWIDTH,
+                        matroska->bandwidth, 0);
+    }
+    return 0;
 }
 
 static int webm_dash_manifest_read_packet(AVFormatContext *s, AVPacket *pkt)
@@ -3923,6 +3939,7 @@ static int webm_dash_manifest_read_packet(AVFormatContext *s, AVPacket *pkt)
 #define OFFSET(x) offsetof(MatroskaDemuxContext, x)
 static const AVOption options[] = {
     { "live", "flag indicating that the input is a live file that only has the headers.", OFFSET(is_live), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
+    { "bandwidth", "bandwidth of this stream to be specified in the DASH manifest.", OFFSET(bandwidth), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
     { NULL },
 };
 

libavformat/webmdashenc.c

@@ -182,14 +182,19 @@ static int write_representation(AVFormatContext *s, AVStream *stream, char *id,
     AVDictionaryEntry *cues_end = av_dict_get(stream->metadata, CUES_END, NULL, 0);
     AVDictionaryEntry *filename = av_dict_get(stream->metadata, FILENAME, NULL, 0);
     AVDictionaryEntry *bandwidth = av_dict_get(stream->metadata, BANDWIDTH, NULL, 0);
+    const char *bandwidth_str;
     if ((w->is_live && (!filename)) ||
         (!w->is_live && (!irange || !cues_start || !cues_end || !filename || !bandwidth))) {
         return AVERROR_INVALIDDATA;
     }
     avio_printf(s->pb, "<Representation id=\"%s\"", id);
-    // FIXME: For live, This should be obtained from the input file or as an AVOption.
-    avio_printf(s->pb, " bandwidth=\"%s\"",
-                w->is_live ? (stream->codecpar->codec_type == AVMEDIA_TYPE_AUDIO ? "128000" : "1000000") : bandwidth->value);
+    // if bandwidth for live was not provided, use a default
+    if (w->is_live && !bandwidth) {
+        bandwidth_str = (stream->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) ? "128000" : "1000000";
+    } else {
+        bandwidth_str = bandwidth->value;
+    }
+    avio_printf(s->pb, " bandwidth=\"%s\"", bandwidth_str);
     if (stream->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && output_width)
         avio_printf(s->pb, " width=\"%d\"", stream->codecpar->width);
     if (stream->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && output_height)

tests/fate/vpx.mak

@@ -70,6 +70,9 @@ fate-webm-dash-manifest-representations: CMD = run $(FFMPEG) -nostdin -f webm_da
 FATE_VP8-$(CONFIG_WEBM_DASH_MANIFEST_DEMUXER) += fate-webm-dash-manifest-live
 fate-webm-dash-manifest-live: CMD = run $(FFMPEG) -nostdin -f webm_dash_manifest -live 1 -i $(TARGET_SAMPLES)/vp8/dash_live_video_360.hdr -f webm_dash_manifest -live 1 -i $(TARGET_SAMPLES)/vp8/dash_live_audio_171.hdr -c copy -map 0 -map 1 -f webm_dash_manifest -live 1 -adaptation_sets "id=0,streams=0 id=1,streams=1" -chunk_start_index 1 -chunk_duration_ms 5000 -time_shift_buffer_depth 7200 -minimum_update_period 60 -debug_mode 1 -
 
+FATE_VP8-$(CONFIG_WEBM_DASH_MANIFEST_DEMUXER) += fate-webm-dash-manifest-live-bandwidth
+fate-webm-dash-manifest-live-bandwidth: CMD = run $(FFMPEG) -nostdin -f webm_dash_manifest -live 1 -bandwidth 100 -i $(TARGET_SAMPLES)/vp8/dash_live_video_360.hdr -f webm_dash_manifest -live 1 -bandwidth 200 -i $(TARGET_SAMPLES)/vp8/dash_live_audio_171.hdr -c copy -map 0 -map 1 -f webm_dash_manifest -live 1 -adaptation_sets "id=0,streams=0 id=1,streams=1" -chunk_start_index 1 -chunk_duration_ms 5000 -time_shift_buffer_depth 7200 -minimum_update_period 60 -debug_mode 1 -
+
 FATE_VP8-$(call DEMDEC, MATROSKA, VP8) += fate-vp8-2451
 fate-vp8-2451: CMD = framecrc -flags +bitexact -i $(TARGET_SAMPLES)/vp8/RRSF49-short.webm -vsync cfr -an
 

tests/ref/fate/webm-dash-manifest-live-bandwidth

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<MPD
+  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xmlns="urn:mpeg:DASH:schema:MPD:2011"
+  xsi:schemaLocation="urn:mpeg:DASH:schema:MPD:2011"
+  type="dynamic"
+  minBufferTime="PT1S"
+  profiles="urn:mpeg:dash:profile:isoff-live:2011"
+  availabilityStartTime=""
+  timeShiftBufferDepth="PT7200S"
+  minimumUpdatePeriod="PT60S">
+<Period id="0" start="PT0S" >
+<AdaptationSet id="0" mimeType="video/webm" codecs="vp9" bitstreamSwitching="true" subsegmentAlignment="true" subsegmentStartsWithSAP="1">
+<ContentComponent id="1" type="video"/>
+<SegmentTemplate timescale="1000" duration="5000" media="dash_live_video_$RepresentationID$_$Number$.chk" startNumber="1" initialization="dash_live_video_$RepresentationID$.hdr"/>
+<Representation id="360" bandwidth="100" width="640" height="360" codecs="vp9" mimeType="video/webm" startsWithSAP="1"></Representation>
+</AdaptationSet>
+<AdaptationSet id="1" mimeType="audio/webm" codecs="vorbis" bitstreamSwitching="true" subsegmentAlignment="true" subsegmentStartsWithSAP="1">
+<ContentComponent id="1" type="audio"/>
+<SegmentTemplate timescale="1000" duration="5000" media="dash_live_audio_$RepresentationID$_$Number$.chk" startNumber="1" initialization="dash_live_audio_$RepresentationID$.hdr"/>
+<Representation id="171" bandwidth="200" audioSamplingRate="32000" codecs="vorbis" mimeType="audio/webm" startsWithSAP="1"></Representation>
+</AdaptationSet>
+</Period>
+</MPD>