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spdifenc: IEC 61937 encapsulation of DTS-HD for HDMI

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Signed-off-by: Janne Grunau <janne-ffmpeg@jannau.net>
This commit is contained in:
Anssi Hannula 2011-01-29 03:36:30 +02:00 committed by Janne Grunau
parent 2315392174
commit 482d98f69b
3 changed files with 150 additions and 2 deletions
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2
Changelog
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@ -55,7 +55,7 @@ version <next>:
- Win64 support for optimized asm functions
- MJPEG/AVI1 to JPEG/JFIF bitstream filter
- ASS subtitle encoder and decoder
- IEC 61937 encapsulation for E-AC3 and TrueHD (for HDMI passthrough)
- IEC 61937 encapsulation for E-AC3, TrueHD, DTS-HD (for HDMI passthrough)
- overlay filter added
- rename aspect filter to setdar, and pixelaspect to setsar
- IEC 61937 demuxer

148
libavformat/spdifenc.c
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@ -48,9 +48,12 @@
#include "spdif.h"
#include "libavcodec/ac3.h"
#include "libavcodec/dca.h"
#include "libavcodec/dcadata.h"
#include "libavcodec/aacadtsdec.h"
#include "libavutil/opt.h"
typedef struct IEC61937Context {
const AVClass *av_class;
enum IEC61937DataType data_type;///< burst info - reference to type of payload of the data-burst
int length_code; ///< length code in bits or bytes, depending on data type
int pkt_offset; ///< data burst repetition period in bytes
@ -68,11 +71,24 @@ typedef struct IEC61937Context {
int hd_buf_count; ///< number of frames in the hd audio buffer
int hd_buf_filled; ///< amount of bytes in the hd audio buffer
int dtshd_skip; ///< counter used for skipping DTS-HD frames
/* AVOptions: */
int dtshd_rate;
int dtshd_fallback;
/// function, which generates codec dependent header information.
/// Sets data_type and pkt_offset, and length_code, out_bytes, out_buf if necessary
int (*header_info) (AVFormatContext *s, AVPacket *pkt);
} IEC61937Context;
static const AVOption options[] = {
{ "dtshd_rate", "mux complete DTS frames in HD mode at the specified IEC958 rate (in Hz, default 0=disabled)", offsetof(IEC61937Context, dtshd_rate), FF_OPT_TYPE_INT, 0, 0, 768000, AV_OPT_FLAG_ENCODING_PARAM },
{ "dtshd_fallback_time", "min secs to strip HD for after an overflow (-1: till the end, default 60)", offsetof(IEC61937Context, dtshd_fallback), FF_OPT_TYPE_INT, 60, -1, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
{ NULL },
};
static const AVClass class = { "spdif", av_default_item_name, options, LIBAVUTIL_VERSION_INT };
static int spdif_header_ac3(AVFormatContext *s, AVPacket *pkt)
{
@ -115,15 +131,125 @@ static int spdif_header_eac3(AVFormatContext *s, AVPacket *pkt)
return 0;
}
/*
* DTS type IV (DTS-HD) can be transmitted with various frame repetition
* periods; longer repetition periods allow for longer packets and therefore
* higher bitrate. Longer repetition periods mean that the constant bitrate of
* the outputted IEC 61937 stream is higher.
* The repetition period is measured in IEC 60958 frames (4 bytes).
*/
enum {
DTS4_REP_PER_512 = 0x0,
DTS4_REP_PER_1024 = 0x1,
DTS4_REP_PER_2048 = 0x2,
DTS4_REP_PER_4096 = 0x3,
DTS4_REP_PER_8192 = 0x4,
DTS4_REP_PER_16384 = 0x5,
};
static int spdif_dts4_subtype(int period)
{
switch (period) {
case 512: return DTS4_REP_PER_512;
case 1024: return DTS4_REP_PER_1024;
case 2048: return DTS4_REP_PER_2048;
case 4096: return DTS4_REP_PER_4096;
case 8192: return DTS4_REP_PER_8192;
case 16384: return DTS4_REP_PER_16384;
}
return -1;
}
static int spdif_header_dts4(AVFormatContext *s, AVPacket *pkt, int core_size,
int sample_rate, int blocks)
{
IEC61937Context *ctx = s->priv_data;
static const char dtshd_start_code[10] = { 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfe, 0xfe };
int pkt_size = pkt->size;
int period;
int subtype;
if (!core_size) {
av_log(s, AV_LOG_ERROR, "HD mode not supported for this format\n");
return AVERROR(EINVAL);
}
if (!sample_rate) {
av_log(s, AV_LOG_ERROR, "Unknown DTS sample rate for HD\n");
return AVERROR_INVALIDDATA;
}
period = ctx->dtshd_rate * (blocks << 5) / sample_rate;
subtype = spdif_dts4_subtype(period);
if (subtype < 0) {
av_log(s, AV_LOG_ERROR, "Specified HD rate of %d Hz would require an "
"impossible repetition period of %d for the current DTS stream"
" (blocks = %d, sample rate = %d)\n", ctx->dtshd_rate, period,
blocks << 5, sample_rate);
return AVERROR(EINVAL);
}
/* set pkt_offset and DTS IV subtype according to the requested output
* rate */
ctx->pkt_offset = period * 4;
ctx->data_type = IEC61937_DTSHD | subtype << 8;
/* If the bitrate is too high for transmitting at the selected
* repetition period setting, strip DTS-HD until a good amount
* of consecutive non-overflowing HD frames have been observed.
* This generally only happens if the caller is cramming a Master
* Audio stream into 192kHz IEC 60958 (which may or may not fit). */
if (sizeof(dtshd_start_code) + 2 + pkt_size
> ctx->pkt_offset - BURST_HEADER_SIZE && core_size) {
if (!ctx->dtshd_skip)
av_log(s, AV_LOG_WARNING, "DTS-HD bitrate too high, "
"temporarily sending core only\n");
if (ctx->dtshd_fallback > 0)
ctx->dtshd_skip = sample_rate * ctx->dtshd_fallback / (blocks << 5);
else
/* skip permanently (-1) or just once (0) */
ctx->dtshd_skip = 1;
}
if (ctx->dtshd_skip && core_size) {
pkt_size = core_size;
if (ctx->dtshd_fallback >= 0)
--ctx->dtshd_skip;
}
ctx->out_bytes = sizeof(dtshd_start_code) + 2 + pkt_size;
ctx->length_code = ctx->out_bytes;
ctx->hd_buf = av_fast_realloc(ctx->hd_buf, &ctx->hd_buf_size,
ctx->out_bytes);
if (!ctx->hd_buf)
return AVERROR(ENOMEM);
ctx->out_buf = ctx->hd_buf;
memcpy(ctx->hd_buf, dtshd_start_code, sizeof(dtshd_start_code));
AV_WB16(ctx->hd_buf + sizeof(dtshd_start_code), pkt_size);
memcpy(ctx->hd_buf + sizeof(dtshd_start_code) + 2, pkt->data, pkt_size);
return 0;
}
static int spdif_header_dts(AVFormatContext *s, AVPacket *pkt)
{
IEC61937Context *ctx = s->priv_data;
uint32_t syncword_dts = AV_RB32(pkt->data);
int blocks;
int sample_rate = 0;
int core_size = 0;
if (pkt->size < 9)
return AVERROR_INVALIDDATA;
switch (syncword_dts) {
case DCA_MARKER_RAW_BE:
blocks = (AV_RB16(pkt->data + 4) >> 2) & 0x7f;
core_size = ((AV_RB24(pkt->data + 5) >> 4) & 0x3fff) + 1;
sample_rate = dca_sample_rates[(pkt->data[8] >> 2) & 0x0f];
break;
case DCA_MARKER_RAW_LE:
blocks = (AV_RL16(pkt->data + 4) >> 2) & 0x7f;
@ -138,11 +264,22 @@ static int spdif_header_dts(AVFormatContext *s, AVPacket *pkt)
(((pkt->data[4] & 0x07) << 4) | ((pkt->data[7] & 0x3f) >> 2));
ctx->extra_bswap = 1;
break;
case DCA_HD_MARKER:
/* We only handle HD frames that are paired with core. However,
sometimes DTS-HD streams with core have a stray HD frame without
core in the beginning of the stream. */
av_log(s, AV_LOG_ERROR, "stray DTS-HD frame\n");
return AVERROR_INVALIDDATA;
default:
av_log(s, AV_LOG_ERROR, "bad DTS syncword 0x%x\n", syncword_dts);
return AVERROR_INVALIDDATA;
}
blocks++;
if (ctx->dtshd_rate)
/* DTS type IV output requested */
return spdif_header_dts4(s, pkt, core_size, sample_rate, blocks);
switch (blocks) {
case 512 >> 5: ctx->data_type = IEC61937_DTS1; break;
case 1024 >> 5: ctx->data_type = IEC61937_DTS2; break;
@ -152,6 +289,13 @@ static int spdif_header_dts(AVFormatContext *s, AVPacket *pkt)
blocks << 5);
return AVERROR(ENOSYS);
}
/* discard extraneous data by default */
if (core_size && core_size < pkt->size) {
ctx->out_bytes = core_size;
ctx->length_code = core_size << 3;
}
ctx->pkt_offset = blocks << 7;
if (ctx->out_bytes == ctx->pkt_offset) {
@ -159,6 +303,9 @@ static int spdif_header_dts(AVFormatContext *s, AVPacket *pkt)
* preamble as it would not fit in there. This is the case for dts
* discs and dts-in-wav. */
ctx->use_preamble = 0;
} else if (ctx->out_bytes > ctx->pkt_offset - BURST_HEADER_SIZE) {
av_log_ask_for_sample(s, "Unrecognized large DTS frame.");
/* This will fail with a "bitrate too high" in the caller */
}
return 0;
@ -393,4 +540,5 @@ AVOutputFormat ff_spdif_muxer = {
spdif_write_header,
spdif_write_packet,
spdif_write_trailer,
.priv_class = &class,
};

2
libavformat/version.h
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@ -25,7 +25,7 @@
#define LIBAVFORMAT_VERSION_MAJOR 52
#define LIBAVFORMAT_VERSION_MINOR 99
#define LIBAVFORMAT_VERSION_MICRO 0
#define LIBAVFORMAT_VERSION_MICRO 1
#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
LIBAVFORMAT_VERSION_MINOR, \