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Code Issues Releases Activity

lavf/mp3enc: write encoder delay/padding upon closing

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Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
This commit is contained in:
Jon Toohill 2016-10-17 14:55:04 -07:00 committed by Andreas Cadhalpun
parent 81f4f789de
commit 3b02f6dd7b
1 changed files with 28 additions and 6 deletions
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34
libavformat/mp3enc.c
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@ -111,6 +111,8 @@ typedef struct MP3Context {
uint64_t bag[XING_NUM_BAGS];
int initial_bitrate;
int has_variable_bitrate;
int delay;
int padding;
/* index of the audio stream */
int audio_stream_idx;
@ -247,12 +249,7 @@ static int mp3_write_xing(AVFormatContext *s)
ffio_fill(dyn_ctx, 0, 8); // empty replaygain fields
avio_w8(dyn_ctx, 0); // unknown encoding flags
avio_w8(dyn_ctx, 0); // unknown abr/minimal bitrate
// encoder delay
if (par->initial_padding - 528 - 1 >= 1 << 12) {
av_log(s, AV_LOG_WARNING, "Too many samples of initial padding.\n");
}
avio_wb24(dyn_ctx, FFMAX(par->initial_padding - 528 - 1, 0)<<12);
avio_wb24(dyn_ctx, 0); // empty encoder delay/padding
avio_w8(dyn_ctx, 0); // misc
avio_w8(dyn_ctx, 0); // mp3gain
@ -345,10 +342,24 @@ static int mp3_write_audio_packet(AVFormatContext *s, AVPacket *pkt)
#endif
if (mp3->xing_offset) {
uint8_t *side_data = NULL;
int side_data_size = 0;
mp3_xing_add_frame(mp3, pkt);
mp3->audio_size += pkt->size;
mp3->audio_crc = av_crc(av_crc_get_table(AV_CRC_16_ANSI_LE),
mp3->audio_crc, pkt->data, pkt->size);
side_data = av_packet_get_side_data(pkt,
AV_PKT_DATA_SKIP_SAMPLES,
&side_data_size);
if (side_data && side_data_size >= 10) {
mp3->padding = FFMAX(AV_RL32(side_data + 4) + 528 + 1, 0);
if (!mp3->delay)
mp3->delay = FFMAX(AV_RL32(side_data) - 528 - 1, 0);
} else {
mp3->padding = 0;
}
}
}
@ -422,6 +433,17 @@ static void mp3_update_xing(AVFormatContext *s)
}
}
/* write encoder delay/padding */
if (mp3->delay >= 1 << 12) {
mp3->delay = (1 << 12) - 1;
av_log(s, AV_LOG_WARNING, "Too many samples of initial padding.\n");
}
if (mp3->padding >= 1 << 12) {
mp3->padding = (1 << 12) - 1;
av_log(s, AV_LOG_WARNING, "Too many samples of trailing padding.\n");
}
AV_WB24(mp3->xing_frame + mp3->xing_offset + 141, (mp3->delay << 12) + mp3->padding);
AV_WB32(mp3->xing_frame + mp3->xing_offset + XING_SIZE - 8, mp3->audio_size);
AV_WB16(mp3->xing_frame + mp3->xing_offset + XING_SIZE - 4, mp3->audio_crc);