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EBU Tech 3285 - Supplement 3 - Peak Envelope Chunk encoder 

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
tags/n2.3
Georg Lippitsch Michael Niedermayer 11 years ago
parent
723550d3ca
commit
e3b03da772
1 changed files with 243 additions and 1 deletions
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  1. +243
    -1
      libavformat/wavenc.c

+ 243
- 1
libavformat/wavenc.c View File

@@ -8,6 +8,9 @@
* WAV muxer RF64 support
* Copyright (c) 2013 Daniel Verkamp <daniel@drv.nu>
*
* EBU Tech 3285 - Supplement 3 - Peak Envelope Chunk encoder
* Copyright (c) 2014 Georg Lippitsch <georg.lippitsch@gmx.at>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
@@ -28,10 +31,13 @@
#include <stdint.h>
#include <string.h>

#include "libavutil/avstring.h"
#include "libavutil/dict.h"
#include "libavutil/common.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
#include "libavutil/time.h"

#include "avformat.h"
#include "avio.h"
@@ -43,6 +49,19 @@
#define RF64_NEVER 0
#define RF64_ALWAYS 1

#define PEAK_BUFFER_SIZE 1024

typedef enum {
PEAK_OFF = 0,
PEAK_ON,
PEAK_ONLY
} PeakType;

typedef enum {
PEAK_FORMAT_UINT8 = 1,
PEAK_FORMAT_UINT16
} PeakFormat;

typedef struct WAVMuxContext {
const AVClass *class;
int64_t data;
@@ -50,9 +69,22 @@ typedef struct WAVMuxContext {
int64_t ds64;
int64_t minpts;
int64_t maxpts;
int16_t *peak_maxpos, *peak_maxneg;
uint32_t peak_num_frames;
uint32_t peak_outbuf_size;
uint32_t peak_outbuf_bytes;
uint32_t peak_pos_pop;
uint16_t peak_pop;
uint8_t *peak_output;
int last_duration;
int write_bext;
int write_peak;
int rf64;
int peak_block_size;
PeakFormat peak_format;
int peak_block_pos;
int peak_ppv;
int peak_bps;
} WAVMuxContext;

#if CONFIG_WAV_MUXER
@@ -110,6 +142,162 @@ static void bwf_write_bext_chunk(AVFormatContext *s)
ff_end_tag(s->pb, bext);
}

static av_cold void peak_free_buffers(AVFormatContext *s)
{
WAVMuxContext *wav = s->priv_data;

av_freep(&wav->peak_maxpos);
av_freep(&wav->peak_maxneg);
av_freep(&wav->peak_output);
}

static av_cold int peak_init_writer(AVFormatContext *s)
{
WAVMuxContext *wav = s->priv_data;
AVCodecContext *enc = s->streams[0]->codec;

if (enc->codec_id != AV_CODEC_ID_PCM_S8 &&
enc->codec_id != AV_CODEC_ID_PCM_S16LE &&
enc->codec_id != AV_CODEC_ID_PCM_U8 &&
enc->codec_id != AV_CODEC_ID_PCM_U16LE) {
av_log(s, AV_LOG_ERROR, "%s codec not supported for Peak Chunk\n",
s->streams[0]->codec->codec ? s->streams[0]->codec->codec->name : "NONE");
return -1;
}

wav->peak_bps = av_get_bits_per_sample(enc->codec_id) / 8;

if (wav->peak_bps == 1 && wav->peak_format == PEAK_FORMAT_UINT16) {
av_log(s, AV_LOG_ERROR,
"Writing 16 bit peak for 8 bit audio does not make sense\n");
return -1;
}

wav->peak_maxpos = av_mallocz(enc->channels * sizeof(*wav->peak_maxpos));
if (!wav->peak_maxpos)
goto nomem;
wav->peak_maxneg = av_mallocz(enc->channels * sizeof(*wav->peak_maxneg));
if (!wav->peak_maxneg)
goto nomem;

wav->peak_output = av_malloc(PEAK_BUFFER_SIZE);
if (!wav->peak_output)
goto nomem;

wav->peak_outbuf_size = PEAK_BUFFER_SIZE;

return 0;

nomem:
av_log(s, AV_LOG_ERROR, "Out of memory\n");
peak_free_buffers(s);
return AVERROR(ENOMEM);
}

static void peak_write_frame(AVFormatContext *s)
{
WAVMuxContext *wav = s->priv_data;
AVCodecContext *enc = s->streams[0]->codec;
int peak_of_peaks;
int c;

if (!wav->peak_output)
return;

for (c = 0; c < enc->channels; c++) {
wav->peak_maxneg[c] = -wav->peak_maxneg[c];

if (wav->peak_bps == 2 && wav->peak_format == PEAK_FORMAT_UINT8) {
wav->peak_maxpos[c] = wav->peak_maxpos[c] / 256;
wav->peak_maxneg[c] = wav->peak_maxneg[c] / 256;
}

if (wav->peak_ppv == 1)
wav->peak_maxpos[c] =
FFMAX(wav->peak_maxpos[c], wav->peak_maxneg[c]);

peak_of_peaks = FFMAX3(wav->peak_maxpos[c], wav->peak_maxneg[c],
wav->peak_pop);
if (peak_of_peaks > wav->peak_pop)
wav->peak_pos_pop = wav->peak_num_frames;
wav->peak_pop = peak_of_peaks;

if (wav->peak_outbuf_size - wav->peak_outbuf_bytes <
wav->peak_format * wav->peak_ppv) {
wav->peak_outbuf_size += PEAK_BUFFER_SIZE;
wav->peak_output = av_realloc(wav->peak_output,
wav->peak_outbuf_size);
if (!wav->peak_output) {
av_log(s, AV_LOG_ERROR, "No memory for peak data\n");
return;
}
}

if (wav->peak_format == PEAK_FORMAT_UINT8) {
wav->peak_output[wav->peak_outbuf_bytes++] =
wav->peak_maxpos[c];
if (wav->peak_ppv == 2) {
wav->peak_output[wav->peak_outbuf_bytes++] =
wav->peak_maxneg[c];
}
} else {
AV_WL16(wav->peak_output + wav->peak_outbuf_bytes,
wav->peak_maxpos[c]);
wav->peak_outbuf_bytes += 2;
if (wav->peak_ppv == 2) {
AV_WL16(wav->peak_output + wav->peak_outbuf_bytes,
wav->peak_maxneg[c]);
wav->peak_outbuf_bytes += 2;
}
}
wav->peak_maxpos[c] = 0;
wav->peak_maxneg[c] = 0;
}
wav->peak_num_frames++;
}

static void peak_write_chunk(AVFormatContext *s)
{
WAVMuxContext *wav = s->priv_data;
AVIOContext *pb = s->pb;
AVCodecContext *enc = s->streams[0]->codec;
int64_t peak = ff_start_tag(s->pb, "levl");
int64_t now0;
time_t now_secs;
char timestamp[28];

/* Peak frame of incomplete block at end */
if (wav->peak_block_pos)
peak_write_frame(s);

memset(timestamp, 0, 28);
if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
av_log(s, AV_LOG_INFO, "Writing local time and date to Peak Envelope Chunk\n");
now0 = av_gettime();
now_secs = now0 / 1000000;
strftime(timestamp, 28, "%Y:%m:%d:%H:%M:%S:", localtime(&now_secs));
av_strlcatf(timestamp, 28, "%03d", (int)((now0 / 1000) % 1000));
}

avio_wl32(pb, 1); /* version */
avio_wl32(pb, wav->peak_format); /* 8 or 16 bit */
avio_wl32(pb, wav->peak_ppv); /* positive and negative */
avio_wl32(pb, wav->peak_block_size); /* frames per value */
avio_wl32(pb, enc->channels); /* number of channels */
avio_wl32(pb, wav->peak_num_frames); /* number of peak frames */
avio_wl32(pb, wav->peak_pos_pop); /* audio sample frame index */
avio_wl32(pb, 128); /* equal to size of header */
avio_write(pb, timestamp, 28); /* ASCII time stamp */
ffio_fill(pb, 0, 60);

avio_write(pb, wav->peak_output, wav->peak_outbuf_bytes);

ff_end_tag(pb, peak);

if (!wav->data)
wav->data = peak;
}

static int wav_write_header(AVFormatContext *s)
{
WAVMuxContext *wav = s->priv_data;
@@ -139,6 +327,7 @@ static int wav_write_header(AVFormatContext *s)
ffio_fill(pb, 0, 28);
}

if (wav->write_peak != 2) {
/* format header */
fmt = ff_start_tag(pb, "fmt ");
if (ff_put_wav_header(pb, s->streams[0]->codec, 0) < 0) {
@@ -148,6 +337,7 @@ static int wav_write_header(AVFormatContext *s)
return AVERROR(ENOSYS);
}
ff_end_tag(pb, fmt);
}

if (s->streams[0]->codec->codec_tag != 0x01 /* hence for all other than PCM */
&& s->pb->seekable) {
@@ -159,15 +349,23 @@ static int wav_write_header(AVFormatContext *s)
if (wav->write_bext)
bwf_write_bext_chunk(s);

if (wav->write_peak) {
int ret;
if ((ret = peak_init_writer(s)) < 0)
return ret;
}

avpriv_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
wav->maxpts = wav->last_duration = 0;
wav->minpts = INT64_MAX;

if (wav->write_peak != 2) {
/* info header */
ff_riff_write_info(s);

/* data header */
wav->data = ff_start_tag(pb, "data");
}

avio_flush(pb);

@@ -178,7 +376,31 @@ static int wav_write_packet(AVFormatContext *s, AVPacket *pkt)
{
AVIOContext *pb = s->pb;
WAVMuxContext *wav = s->priv_data;

if (wav->write_peak != 2)
avio_write(pb, pkt->data, pkt->size);

if (wav->write_peak) {
int c = 0;
int i;
for (i = 0; i < pkt->size; i += wav->peak_bps) {
if (wav->peak_bps == 1) {
wav->peak_maxpos[c] = FFMAX(wav->peak_maxpos[c], *(int8_t*)(pkt->data + i));
wav->peak_maxneg[c] = FFMIN(wav->peak_maxneg[c], *(int8_t*)(pkt->data + i));
} else {
wav->peak_maxpos[c] = FFMAX(wav->peak_maxpos[c], (int16_t)AV_RL16(pkt->data + i));
wav->peak_maxneg[c] = FFMIN(wav->peak_maxneg[c], (int16_t)AV_RL16(pkt->data + i));
}
if (++c == s->streams[0]->codec->channels) {
c = 0;
if (++wav->peak_block_pos == wav->peak_block_size) {
peak_write_frame(s);
wav->peak_block_pos = 0;
}
}
}
}

if(pkt->pts != AV_NOPTS_VALUE) {
wav->minpts = FFMIN(wav->minpts, pkt->pts);
wav->maxpts = FFMAX(wav->maxpts, pkt->pts);
@@ -199,6 +421,16 @@ static int wav_write_trailer(AVFormatContext *s)
avio_flush(pb);

if (s->pb->seekable) {
if (wav->write_peak != 2) {
ff_end_tag(pb, wav->data);
avio_flush(pb);
}

if (wav->write_peak && wav->peak_output) {
peak_write_chunk(s);
avio_flush(pb);
}

/* update file size */
file_size = avio_tell(pb);
data_size = file_size - wav->data;
@@ -209,7 +441,6 @@ static int wav_write_trailer(AVFormatContext *s)
avio_wl32(pb, (uint32_t)(file_size - 8));
avio_seek(pb, file_size, SEEK_SET);

ff_end_tag(pb, wav->data);
avio_flush(pb);
}

@@ -253,6 +484,10 @@ static int wav_write_trailer(AVFormatContext *s)
avio_flush(pb);
}
}

if (wav->write_peak)
peak_free_buffers(s);

return 0;
}

@@ -260,10 +495,17 @@ static int wav_write_trailer(AVFormatContext *s)
#define ENC AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
{ "write_bext", "Write BEXT chunk.", OFFSET(write_bext), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, ENC },
{ "write_peak", "Write Peak Envelope chunk.", OFFSET(write_peak), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 2, ENC, "peak" },
{ "off", "Do not write peak chunk.", 0, AV_OPT_TYPE_CONST, { .i64 = PEAK_OFF }, 0, 0, ENC, "peak" },
{ "on", "Append peak chunk after wav data.", 0, AV_OPT_TYPE_CONST, { .i64 = PEAK_ON }, 0, 0, ENC, "peak" },
{ "only", "Write only peak chunk, omit wav data.", 0, AV_OPT_TYPE_CONST, { .i64 = PEAK_ONLY }, 0, 0, ENC, "peak" },
{ "rf64", "Use RF64 header rather than RIFF for large files.", OFFSET(rf64), AV_OPT_TYPE_INT, { .i64 = RF64_NEVER },-1, 1, ENC, "rf64" },
{ "auto", "Write RF64 header if file grows large enough.", 0, AV_OPT_TYPE_CONST, { .i64 = RF64_AUTO }, 0, 0, ENC, "rf64" },
{ "always", "Always write RF64 header regardless of file size.", 0, AV_OPT_TYPE_CONST, { .i64 = RF64_ALWAYS }, 0, 0, ENC, "rf64" },
{ "never", "Never write RF64 header regardless of file size.", 0, AV_OPT_TYPE_CONST, { .i64 = RF64_NEVER }, 0, 0, ENC, "rf64" },
{ "peak_block_size", "Number of audio samples used to generate each peak frame.", OFFSET(peak_block_size), AV_OPT_TYPE_INT, { .i64 = 256 }, 0, 65536, ENC },
{ "peak_format", "The format of the peak envelope data (1: uint8, 2: uint16).", OFFSET(peak_format), AV_OPT_TYPE_INT, { .i64 = PEAK_FORMAT_UINT16 }, PEAK_FORMAT_UINT8, PEAK_FORMAT_UINT16, ENC },
{ "peak_ppv", "Number of peak points per peak value (1 or 2).", OFFSET(peak_ppv), AV_OPT_TYPE_INT, { .i64 = 2 }, 1, 2, ENC },
{ NULL },
};



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