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-rw-r--r--libavcodec/Makefile2
-rw-r--r--libavcodec/pcm-dvd.c287
-rw-r--r--libavcodec/pcm.c43
-rw-r--r--libavcodec/version.h2
-rw-r--r--libavformat/mpeg.c28
5 files changed, 291 insertions, 71 deletions
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 2eba60fe75..bb4f960356 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -427,7 +427,7 @@ OBJS-$(CONFIG_ZMBV_ENCODER) += zmbvenc.o
OBJS-$(CONFIG_PCM_ALAW_DECODER) += pcm.o
OBJS-$(CONFIG_PCM_ALAW_ENCODER) += pcm.o
OBJS-$(CONFIG_PCM_BLURAY_DECODER) += pcm-bluray.o
-OBJS-$(CONFIG_PCM_DVD_DECODER) += pcm.o
+OBJS-$(CONFIG_PCM_DVD_DECODER) += pcm-dvd.o
OBJS-$(CONFIG_PCM_F32BE_DECODER) += pcm.o
OBJS-$(CONFIG_PCM_F32BE_ENCODER) += pcm.o
OBJS-$(CONFIG_PCM_F32LE_DECODER) += pcm.o
diff --git a/libavcodec/pcm-dvd.c b/libavcodec/pcm-dvd.c
new file mode 100644
index 0000000000..8e88ad46b3
--- /dev/null
+++ b/libavcodec/pcm-dvd.c
@@ -0,0 +1,287 @@
+/*
+ * LPCM codecs for PCM formats found in Video DVD streams
+ * Copyright (c) 2009-2013 Christian Schmidt
+ *
+ * This file is part of Libav.
+ *
+ * Libav is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * Libav is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * LPCM codecs for PCM formats found in Video DVD streams
+ */
+
+#include "avcodec.h"
+#include "bytestream.h"
+#include "internal.h"
+
+typedef struct PCMDVDContext {
+ uint32_t last_header; // Cached header to see if parsing is needed
+ int block_size; // Size of a block of samples in bytes
+ int samples_per_block; // Number of samples per channel per block
+ int groups_per_block; // Number of 20/24bit sample groups per block
+ uint8_t *extra_samples; // Pointer to leftover samples from a frame
+ int extra_sample_count; // Number of leftover samples in the buffer
+} PCMDVDContext;
+
+static av_cold int pcm_dvd_decode_init(AVCodecContext *avctx)
+{
+ PCMDVDContext *s = avctx->priv_data;
+
+ /* Invalid header to force parsing of the first header */
+ s->last_header = -1;
+ /* reserve space for 8 channels, 3 bytes/sample, 4 samples/block */
+ if (!(s->extra_samples = av_malloc(8 * 3 * 4)))
+ return AVERROR(ENOMEM);
+ s->extra_sample_count = 0;
+
+ return 0;
+}
+
+static av_cold int pcm_dvd_decode_uninit(AVCodecContext *avctx)
+{
+ PCMDVDContext *s = avctx->priv_data;
+
+ if (s->extra_samples)
+ av_free(s->extra_samples);
+
+ return 0;
+}
+
+static int pcm_dvd_parse_header(AVCodecContext *avctx, const uint8_t *header)
+{
+ /* no traces of 44100 and 32000Hz in any commercial software or player */
+ static const uint32_t frequencies[4] = { 48000, 96000, 44100, 32000 };
+ PCMDVDContext *s = avctx->priv_data;
+ int header_int = (header[0] & 0xe0) | (header[1] << 8) | (header[2] << 16);
+
+ /* early exit if the header didn't change apart from the frame number */
+ if (s->last_header == header_int)
+ return 0;
+
+ if (avctx->debug & FF_DEBUG_PICT_INFO)
+ av_dlog(avctx, "pcm_dvd_parse_header: header = %02x%02x%02x\n",
+ header[0], header[1], header[2]);
+ /*
+ * header[0] emphasis (1), muse(1), reserved(1), frame number(5)
+ * header[1] quant (2), freq(2), reserved(1), channels(3)
+ * header[2] dynamic range control (0x80 = off)
+ */
+
+ /* get the sample depth and derive the sample format from it */
+ avctx->bits_per_coded_sample = 16 + (header[1] >> 6 & 3) * 4;
+ if (avctx->bits_per_coded_sample == 28) {
+ av_log(avctx, AV_LOG_ERROR, "PCM DVD unsupported sample depth\n");
+ return AVERROR_INVALIDDATA;
+ }
+ avctx->sample_fmt = avctx->bits_per_coded_sample == 16 ? AV_SAMPLE_FMT_S16
+ : AV_SAMPLE_FMT_S32;
+ avctx->bits_per_raw_sample = avctx->bits_per_coded_sample;
+
+ /* get the sample rate */
+ avctx->sample_rate = frequencies[header[1] >> 4 & 3];
+
+ /* get the number of channels */
+ avctx->channels = 1 + (header[1] & 7);
+ /* calculate the bitrate */
+ avctx->bit_rate = avctx->channels *
+ avctx->sample_rate *
+ avctx->bits_per_coded_sample;
+
+ /* 4 samples form a group in 20/24bit PCM on DVD Video.
+ * A block is formed by the number of groups that are
+ * needed to complete a set of samples for each channel. */
+ if (avctx->bits_per_coded_sample == 16) {
+ s->samples_per_block = 1;
+ s->block_size = avctx->channels * 2;
+ } else {
+ switch (avctx->channels) {
+ case 1:
+ case 2:
+ case 4:
+ /* one group has all the samples needed */
+ s->block_size = 4 * avctx->bits_per_coded_sample / 8;
+ s->samples_per_block = 4 / avctx->channels;
+ s->groups_per_block = 1;
+ break;
+ case 8:
+ /* two groups have all the samples needed */
+ s->block_size = 8 * avctx->bits_per_coded_sample / 8;
+ s->samples_per_block = 1;
+ s->groups_per_block = 2;
+ break;
+ default:
+ /* need avctx->channels groups */
+ s->block_size = 4 * avctx->channels *
+ avctx->bits_per_coded_sample / 8;
+ s->samples_per_block = 4;
+ s->groups_per_block = avctx->channels;
+ break;
+ }
+ }
+
+ if (avctx->debug & FF_DEBUG_PICT_INFO)
+ av_dlog(avctx,
+ "pcm_dvd_parse_header: %d channels, %d bits per sample, %d Hz, %d bit/s\n",
+ avctx->channels, avctx->bits_per_coded_sample,
+ avctx->sample_rate, avctx->bit_rate);
+
+ s->last_header = header_int;
+
+ return 0;
+}
+
+static void *pcm_dvd_decode_samples(AVCodecContext *avctx, const uint8_t *src,
+ void *dst, int blocks)
+{
+ PCMDVDContext *s = avctx->priv_data;
+ int16_t *dst16 = dst;
+ int32_t *dst32 = dst;
+ GetByteContext gb;
+ int i;
+ uint8_t t;
+ int samples;
+
+ bytestream2_init(&gb, src, blocks * s->block_size);
+ switch (avctx->bits_per_coded_sample) {
+ case 16:
+#if HAVE_BIGENDIAN
+ bytestream2_get_buffer(&gb, dst16, blocks * s->block_size);
+ dst16 += blocks * block_size / 2;
+#else
+ samples = blocks * avctx->channels;
+ do {
+ *dst16++ = bytestream2_get_be16u(&gb);
+ } while (--samples);
+#endif
+ return dst16;
+ case 20:
+ do {
+ for (i = s->groups_per_block; i; i--) {
+ dst32[0] = bytestream2_get_be16u(&gb) << 16;
+ dst32[1] = bytestream2_get_be16u(&gb) << 16;
+ dst32[2] = bytestream2_get_be16u(&gb) << 16;
+ dst32[3] = bytestream2_get_be16u(&gb) << 16;
+ t = bytestream2_get_byteu(&gb);
+ *dst32 += (t & 0xf0) << 8;
+ *dst32 += (t & 0x0f) << 12;
+ t = bytestream2_get_byteu(&gb);
+ *dst32 += (t & 0xf0) << 8;
+ *dst32 += (t & 0x0f) << 12;
+ }
+ } while (--blocks);
+ return dst32;
+ case 24:
+ do {
+ for (i = s->groups_per_block; i; i--) {
+ dst32[0] = bytestream2_get_be16u(&gb) << 16;
+ dst32[1] = bytestream2_get_be16u(&gb) << 16;
+ dst32[2] = bytestream2_get_be16u(&gb) << 16;
+ dst32[3] = bytestream2_get_be16u(&gb) << 16;
+ *dst32++ += bytestream2_get_byteu(&gb) << 8;
+ *dst32++ += bytestream2_get_byteu(&gb) << 8;
+ *dst32++ += bytestream2_get_byteu(&gb) << 8;
+ *dst32++ += bytestream2_get_byteu(&gb) << 8;
+ }
+ } while (--blocks);
+ return dst32;
+ default:
+ return NULL;
+ }
+}
+
+static int pcm_dvd_decode_frame(AVCodecContext *avctx, void *data,
+ int *got_frame_ptr, AVPacket *avpkt)
+{
+ AVFrame *frame = data;
+ const uint8_t *src = avpkt->data;
+ int buf_size = avpkt->size;
+ PCMDVDContext *s = avctx->priv_data;
+ int retval;
+ int blocks;
+ void *dst;
+
+ if (buf_size < 3) {
+ av_log(avctx, AV_LOG_ERROR, "PCM packet too small\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ if ((retval = pcm_dvd_parse_header(avctx, src)))
+ return retval;
+ src += 3;
+ buf_size -= 3;
+
+ blocks = (buf_size + s->extra_sample_count) / s->block_size;
+
+ /* get output buffer */
+ frame->nb_samples = blocks * s->samples_per_block;
+ if ((retval = ff_get_buffer(avctx, frame, 0)) < 0) {
+ av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+ return retval;
+ }
+ dst = frame->data[0];
+
+ /* consume leftover samples from last packet */
+ if (s->extra_sample_count) {
+ int missing_samples = s->block_size - s->extra_sample_count;
+ if (buf_size >= missing_samples) {
+ memcpy(s->extra_samples + s->extra_sample_count, src,
+ missing_samples);
+ dst = pcm_dvd_decode_samples(avctx, s->extra_samples, dst, 1);
+ src += missing_samples;
+ buf_size -= missing_samples;
+ s->extra_sample_count = 0;
+ blocks--;
+ } else {
+ /* new packet still doesn't have enough samples */
+ memcpy(s->extra_samples + s->extra_sample_count, src, buf_size);
+ s->extra_sample_count += buf_size;
+ return avpkt->size;
+ }
+ }
+
+ /* decode remaining complete samples */
+ if (blocks) {
+ pcm_dvd_decode_samples(avctx, src, dst, blocks);
+ buf_size -= blocks * s->block_size;
+ }
+
+ /* store leftover samples */
+ if (buf_size) {
+ src += blocks * s->block_size;
+ memcpy(s->extra_samples, src, buf_size);
+ s->extra_sample_count = buf_size;
+ }
+
+ *got_frame_ptr = 1;
+
+ return avpkt->size;
+}
+
+AVCodec ff_pcm_dvd_decoder = {
+ .name = "pcm_dvd",
+ .long_name = NULL_IF_CONFIG_SMALL("PCM signed 16|20|24-bit big-endian for DVD media"),
+ .type = AVMEDIA_TYPE_AUDIO,
+ .id = AV_CODEC_ID_PCM_DVD,
+ .priv_data_size = sizeof(PCMDVDContext),
+ .init = pcm_dvd_decode_init,
+ .decode = pcm_dvd_decode_frame,
+ .close = pcm_dvd_decode_uninit,
+ .capabilities = CODEC_CAP_DR1,
+ .sample_fmts = (const enum AVSampleFormat[]) {
+ AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_NONE
+ }
+};
diff --git a/libavcodec/pcm.c b/libavcodec/pcm.c
index 31ee283daf..5b3bdf44e9 100644
--- a/libavcodec/pcm.c
+++ b/libavcodec/pcm.c
@@ -265,16 +265,7 @@ static int pcm_decode_frame(AVCodecContext *avctx, void *data,
/* av_get_bits_per_sample returns 0 for AV_CODEC_ID_PCM_DVD */
samples_per_block = 1;
- if (avctx->codec->id == AV_CODEC_ID_PCM_DVD) {
- if (avctx->bits_per_coded_sample != 20 &&
- avctx->bits_per_coded_sample != 24) {
- av_log(avctx, AV_LOG_ERROR, "PCM DVD unsupported sample depth\n");
- return AVERROR(EINVAL);
- }
- /* 2 samples are interleaved per block in PCM_DVD */
- samples_per_block = 2;
- sample_size = avctx->bits_per_coded_sample * 2 / 8;
- } else if (avctx->codec_id == AV_CODEC_ID_PCM_LXF) {
+ if (avctx->codec_id == AV_CODEC_ID_PCM_LXF) {
/* we process 40-bit blocks per channel for LXF */
samples_per_block = 2;
sample_size = 5;
@@ -408,37 +399,6 @@ static int pcm_decode_frame(AVCodecContext *avctx, void *data,
samples += 2;
}
break;
- case AV_CODEC_ID_PCM_DVD:
- {
- const uint8_t *src8;
- dst_int32_t = (int32_t *)frame->data[0];
- n /= avctx->channels;
- switch (avctx->bits_per_coded_sample) {
- case 20:
- while (n--) {
- c = avctx->channels;
- src8 = src + 4 * c;
- while (c--) {
- *dst_int32_t++ = (bytestream_get_be16(&src) << 16) + ((*src8 & 0xf0) << 8);
- *dst_int32_t++ = (bytestream_get_be16(&src) << 16) + ((*src8++ & 0x0f) << 12);
- }
- src = src8;
- }
- break;
- case 24:
- while (n--) {
- c = avctx->channels;
- src8 = src + 4 * c;
- while (c--) {
- *dst_int32_t++ = (bytestream_get_be16(&src) << 16) + ((*src8++) << 8);
- *dst_int32_t++ = (bytestream_get_be16(&src) << 16) + ((*src8++) << 8);
- }
- src = src8;
- }
- break;
- }
- break;
- }
case AV_CODEC_ID_PCM_LXF:
{
int i;
@@ -522,7 +482,6 @@ AVCodec ff_ ## name_ ## _decoder = { \
/* Note: Do not forget to add new entries to the Makefile as well. */
PCM_CODEC (PCM_ALAW, AV_SAMPLE_FMT_S16, pcm_alaw, "PCM A-law");
-PCM_DECODER(PCM_DVD, AV_SAMPLE_FMT_S32, pcm_dvd, "PCM signed 20|24-bit big-endian");
PCM_CODEC (PCM_F32BE, AV_SAMPLE_FMT_FLT, pcm_f32be, "PCM 32-bit floating point big-endian");
PCM_CODEC (PCM_F32LE, AV_SAMPLE_FMT_FLT, pcm_f32le, "PCM 32-bit floating point little-endian");
PCM_CODEC (PCM_F64BE, AV_SAMPLE_FMT_DBL, pcm_f64be, "PCM 64-bit floating point big-endian");
diff --git a/libavcodec/version.h b/libavcodec/version.h
index 1c6efe6fec..980c5c5240 100644
--- a/libavcodec/version.h
+++ b/libavcodec/version.h
@@ -27,7 +27,7 @@
*/
#define LIBAVCODEC_VERSION_MAJOR 55
-#define LIBAVCODEC_VERSION_MINOR 17
+#define LIBAVCODEC_VERSION_MINOR 18
#define LIBAVCODEC_VERSION_MICRO 0
#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
diff --git a/libavformat/mpeg.c b/libavformat/mpeg.c
index 8a4c6d7acc..7430bb0113 100644
--- a/libavformat/mpeg.c
+++ b/libavformat/mpeg.c
@@ -453,7 +453,6 @@ static int mpegps_read_packet(AVFormatContext *s,
codec_id = AV_CODEC_ID_DTS;
} else if (startcode >= 0xa0 && startcode <= 0xaf) {
type = AVMEDIA_TYPE_AUDIO;
- /* 16 bit form will be handled as AV_CODEC_ID_PCM_S16BE */
codec_id = AV_CODEC_ID_PCM_DVD;
} else if (startcode >= 0xb0 && startcode <= 0xbf) {
type = AVMEDIA_TYPE_AUDIO;
@@ -494,35 +493,10 @@ static int mpegps_read_packet(AVFormatContext *s,
st->id = startcode;
st->codec->codec_type = type;
st->codec->codec_id = codec_id;
- if (codec_id != AV_CODEC_ID_PCM_S16BE)
- st->need_parsing = AVSTREAM_PARSE_FULL;
+ st->need_parsing = AVSTREAM_PARSE_FULL;
found:
if(st->discard >= AVDISCARD_ALL)
goto skip;
- if ((startcode >= 0xa0 && startcode <= 0xaf) ||
- (startcode == 0x1bd && ((dvdaudio_substream_type & 0xe0) == 0xa0))) {
- int b1, freq;
-
- /* for LPCM, we just skip the header and consider it is raw
- audio data */
- if (len <= 3)
- goto skip;
- avio_r8(s->pb); /* emphasis (1), muse(1), reserved(1), frame number(5) */
- b1 = avio_r8(s->pb); /* quant (2), freq(2), reserved(1), channels(3) */
- avio_r8(s->pb); /* dynamic range control (0x80 = off) */
- len -= 3;
- freq = (b1 >> 4) & 3;
- st->codec->sample_rate = lpcm_freq_tab[freq];
- st->codec->channels = 1 + (b1 & 7);
- st->codec->bits_per_coded_sample = 16 + ((b1 >> 6) & 3) * 4;
- st->codec->bit_rate = st->codec->channels *
- st->codec->sample_rate *
- st->codec->bits_per_coded_sample;
- if (st->codec->bits_per_coded_sample == 16)
- st->codec->codec_id = AV_CODEC_ID_PCM_S16BE;
- else if (st->codec->bits_per_coded_sample == 28)
- return AVERROR(EINVAL);
- }
ret = av_get_packet(s->pb, pkt, len);
pkt->pts = pts;
pkt->dts = dts;
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-01 19:34:54 +0000