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avcodec: add SDX2 DPCM decoder

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Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2015-10-24 20:41:32 +02:00
parent 2ccc1b304e
commit 035ae3c009
12 changed files with 50 additions and 5 deletions
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1
Changelog
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@ -25,6 +25,7 @@ version <next>:
- wve demuxer
- zero-copy Intel QSV transcoding in ffmpeg
- shuffleframes filter
- SDX2 DPCM decoder
version 2.8:

2
doc/general.texi
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@ -960,6 +960,8 @@ following image formats are supported:
@tab Used in Quake III, Jedi Knight 2 and other computer games.
@item DPCM Interplay @tab @tab X
@tab Used in various Interplay computer games.
@item DPCM Squareroot-Delta-Exact
@tab Used in various games.
@item DPCM Sierra Online @tab @tab X
@tab Used in Sierra Online game audio files.
@item DPCM Sol @tab @tab X

1
libavcodec/Makefile
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@ -458,6 +458,7 @@ OBJS-$(CONFIG_S302M_DECODER) += s302m.o
OBJS-$(CONFIG_S302M_ENCODER) += s302menc.o
OBJS-$(CONFIG_SANM_DECODER) += sanm.o
OBJS-$(CONFIG_SCREENPRESSO_DECODER) += screenpresso.o
OBJS-$(CONFIG_SDX2_DPCM_DECODER) += dpcm.o
OBJS-$(CONFIG_SGI_DECODER) += sgidec.o
OBJS-$(CONFIG_SGI_ENCODER) += sgienc.o rle.o
OBJS-$(CONFIG_SGIRLE_DECODER) += sgirledec.o

1
libavcodec/allcodecs.c
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@ -287,6 +287,7 @@ void avcodec_register_all(void)
REGISTER_ENCDEC (S302M, s302m);
REGISTER_DECODER(SANM, sanm);
REGISTER_DECODER(SCREENPRESSO, screenpresso);
REGISTER_DECODER(SDX2_DPCM, sdx2_dpcm);
REGISTER_ENCDEC (SGI, sgi);
REGISTER_DECODER(SGIRLE, sgirle);
REGISTER_DECODER(SMACKER, smacker);

2
libavcodec/avcodec.h
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@ -410,6 +410,8 @@ enum AVCodecID {
AV_CODEC_ID_XAN_DPCM,
AV_CODEC_ID_SOL_DPCM,
AV_CODEC_ID_SDX2_DPCM = 0x14800,
/* audio codecs */
AV_CODEC_ID_MP2 = 0x15000,
AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3

7
libavcodec/codec_desc.c
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@ -2054,6 +2054,13 @@ static const AVCodecDescriptor codec_descriptors[] = {
.long_name = NULL_IF_CONFIG_SMALL("DPCM Sol"),
.props = AV_CODEC_PROP_LOSSY,
},
{
.id = AV_CODEC_ID_SDX2_DPCM,
.type = AVMEDIA_TYPE_AUDIO,
.name = "sdx2_dpcm",
.long_name = NULL_IF_CONFIG_SMALL("DPCM Squareroot-Delta-Exact"),
.props = AV_CODEC_PROP_LOSSY,
},
/* audio codecs */
{

32
libavcodec/dpcm.c
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@ -44,7 +44,7 @@
#include "mathops.h"
typedef struct DPCMContext {
int16_t roq_square_array[256];
int16_t square_array[256];
int sample[2]; ///< previous sample (for SOL_DPCM)
const int8_t *sol_table; ///< delta table for SOL_DPCM
} DPCMContext;
@ -130,8 +130,8 @@ static av_cold int dpcm_decode_init(AVCodecContext *avctx)
/* initialize square table */
for (i = 0; i < 128; i++) {
int16_t square = i * i;
s->roq_square_array[i ] = square;
s->roq_square_array[i + 128] = -square;
s->square_array[i ] = square;
s->square_array[i + 128] = -square;
}
break;
@ -153,6 +153,13 @@ static av_cold int dpcm_decode_init(AVCodecContext *avctx)
}
break;
case AV_CODEC_ID_SDX2_DPCM:
for (i = -128; i < 128; i++) {
int16_t square = i * i * 2;
s->square_array[i+128] = i < 0 ? -square: square;
}
break;
default:
break;
}
@ -200,6 +207,9 @@ static int dpcm_decode_frame(AVCodecContext *avctx, void *data,
else
out = buf_size;
break;
case AV_CODEC_ID_SDX2_DPCM:
out = buf_size;
break;
}
if (out <= 0) {
av_log(avctx, AV_LOG_ERROR, "packet is too small\n");
@ -230,7 +240,7 @@ static int dpcm_decode_frame(AVCodecContext *avctx, void *data,
/* decode the samples */
while (output_samples < samples_end) {
predictor[ch] += s->roq_square_array[bytestream2_get_byteu(&gb)];
predictor[ch] += s->square_array[bytestream2_get_byteu(&gb)];
predictor[ch] = av_clip_int16(predictor[ch]);
*output_samples++ = predictor[ch];
@ -318,6 +328,19 @@ static int dpcm_decode_frame(AVCodecContext *avctx, void *data,
}
}
break;
case AV_CODEC_ID_SDX2_DPCM:
while (output_samples < samples_end) {
int8_t n = bytestream2_get_byteu(&gb);
if (!(n & 1))
s->sample[ch] = 0;
s->sample[ch] += s->square_array[n + 128];
s->sample[ch] = av_clip_int16(s->sample[ch]);
*output_samples++ = s->sample[ch];
ch ^= stereo;
}
break;
}
*got_frame_ptr = 1;
@ -339,5 +362,6 @@ AVCodec ff_ ## name_ ## _decoder = { \
DPCM_DECODER(AV_CODEC_ID_INTERPLAY_DPCM, interplay_dpcm, "DPCM Interplay");
DPCM_DECODER(AV_CODEC_ID_ROQ_DPCM, roq_dpcm, "DPCM id RoQ");
DPCM_DECODER(AV_CODEC_ID_SDX2_DPCM, sdx2_dpcm, "DPCM Squareroot-Delta-Exact");
DPCM_DECODER(AV_CODEC_ID_SOL_DPCM, sol_dpcm, "DPCM Sol");
DPCM_DECODER(AV_CODEC_ID_XAN_DPCM, xan_dpcm, "DPCM Xan");

1
libavcodec/utils.c
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@ -2906,6 +2906,7 @@ int av_get_exact_bits_per_sample(enum AVCodecID codec_id)
case AV_CODEC_ID_PCM_S8_PLANAR:
case AV_CODEC_ID_PCM_U8:
case AV_CODEC_ID_PCM_ZORK:
case AV_CODEC_ID_SDX2_DPCM:
return 8;
case AV_CODEC_ID_PCM_S16BE:
case AV_CODEC_ID_PCM_S16BE_PLANAR:

2
libavcodec/version.h
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@ -29,7 +29,7 @@
#include "libavutil/version.h"
#define LIBAVCODEC_VERSION_MAJOR 57
#define LIBAVCODEC_VERSION_MINOR 9
#define LIBAVCODEC_VERSION_MINOR 10
#define LIBAVCODEC_VERSION_MICRO 100
#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \

1
libavformat/aiff.h
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@ -52,6 +52,7 @@ static const AVCodecTag ff_codec_aiff_tags[] = {
{ AV_CODEC_ID_ADPCM_IMA_QT, MKTAG('i','m','a','4') },
{ AV_CODEC_ID_QDM2, MKTAG('Q','D','M','2') },
{ AV_CODEC_ID_QCELP, MKTAG('Q','c','l','p') },
{ AV_CODEC_ID_SDX2_DPCM, MKTAG('S','D','X','2') },
{ AV_CODEC_ID_NONE, 0 },
};

1
libavformat/aiffdec.c
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@ -159,6 +159,7 @@ static int get_aiff_header(AVFormatContext *s, int size,
codec->bits_per_coded_sample = 5;
case AV_CODEC_ID_ADPCM_G722:
case AV_CODEC_ID_MACE6:
case AV_CODEC_ID_SDX2_DPCM:
codec->block_align = 1*codec->channels;
break;
case AV_CODEC_ID_GSM:

4
libavformat/genh.c
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@ -84,6 +84,7 @@ static int genh_read_header(AVFormatContext *s)
case 5: st->codec->codec_id = st->codec->block_align > 0 ?
AV_CODEC_ID_PCM_S8_PLANAR :
AV_CODEC_ID_PCM_S8; break;
case 6: st->codec->codec_id = AV_CODEC_ID_SDX2_DPCM; break;
case 7: ret = ff_alloc_extradata(st->codec, 2);
if (ret < 0)
return ret;
@ -168,6 +169,9 @@ static int genh_read_packet(AVFormatContext *s, AVPacket *pkt)
}
}
ret = 0;
} else if (codec->codec_id == AV_CODEC_ID_SDX2_DPCM) {
ret = av_get_packet(s->pb, pkt, codec->block_align * 1024);
} else {
ret = av_get_packet(s->pb, pkt, codec->block_align ? codec->block_align : 1024 * codec->channels);
}