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Diffstat (limited to 'libavcodec/8svx.c')
-rw-r--r--libavcodec/8svx.c121
1 files changed, 49 insertions, 72 deletions
diff --git a/libavcodec/8svx.c b/libavcodec/8svx.c
index 11fbf193ce..eff525c951 100644
--- a/libavcodec/8svx.c
+++ b/libavcodec/8svx.c
@@ -1,21 +1,21 @@
/*
- * 8SVX audio decoder
* Copyright (C) 2008 Jaikrishnan Menon
+ * Copyright (C) 2011 Stefano Sabatini
*
- * This file is part of Libav.
+ * This file is part of FFmpeg.
*
- * Libav is free software; you can redistribute it and/or
+ * FFmpeg 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,
+ * FFmpeg 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
+ * License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
@@ -26,8 +26,18 @@
*
* supports: fibonacci delta encoding
* : exponential encoding
+ *
+ * For more information about the 8SVX format:
+ * http://netghost.narod.ru/gff/vendspec/iff/iff.txt
+ * http://sox.sourceforge.net/AudioFormats-11.html
+ * http://aminet.net/package/mus/misc/wavepak
+ * http://amigan.1emu.net/reg/8SVX.txt
+ *
+ * Samples can be found here:
+ * http://aminet.net/mods/smpl/
*/
+#include "libavutil/avassert.h"
#include "avcodec.h"
#include "internal.h"
#include "libavutil/common.h"
@@ -44,18 +54,17 @@ typedef struct EightSvxContext {
int data_idx;
} EightSvxContext;
-static const int8_t fibonacci[16] = { -34, -21, -13, -8, -5, -3, -2, -1,
- 0, 1, 2, 3, 5, 8, 13, 21 };
-static const int8_t exponential[16] = { -128, -64, -32, -16, -8, -4, -2, -1,
- 0, 1, 2, 4, 8, 16, 32, 64 };
+static const int8_t fibonacci[16] = { -34, -21, -13, -8, -5, -3, -2, -1, 0, 1, 2, 3, 5, 8, 13, 21 };
+static const int8_t exponential[16] = { -128, -64, -32, -16, -8, -4, -2, -1, 0, 1, 2, 4, 8, 16, 32, 64 };
-#define MAX_FRAME_SIZE 32768
+#define MAX_FRAME_SIZE 2048
/**
* Delta decode the compressed values in src, and put the resulting
* decoded samples in dst.
*
* @param[in,out] state starting value. it is saved for use in the next call.
+ * @param table delta sequence table
*/
static void delta_decode(uint8_t *dst, const uint8_t *src, int src_size,
uint8_t *state, const int8_t *table)
@@ -73,12 +82,6 @@ static void delta_decode(uint8_t *dst, const uint8_t *src, int src_size,
*state = val;
}
-static void raw_decode(uint8_t *dst, const int8_t *src, int src_size)
-{
- while (src_size--)
- *dst++ = *src++ + 128;
-}
-
/** decode a frame */
static int eightsvx_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame_ptr, AVPacket *avpkt)
@@ -87,27 +90,23 @@ static int eightsvx_decode_frame(AVCodecContext *avctx, void *data,
AVFrame *frame = data;
int buf_size;
int ch, ret;
- int is_compr = (avctx->codec_id != AV_CODEC_ID_PCM_S8_PLANAR);
+ int hdr_size = 2;
- /* for the first packet, copy data to buffer */
- if (avpkt->data) {
- int hdr_size = is_compr ? 2 : 0;
- int chan_size = (avpkt->size - hdr_size * avctx->channels) / avctx->channels;
+ /* decode and interleave the first packet */
+ if (!esc->data[0] && avpkt) {
+ int chan_size = avpkt->size / avctx->channels - hdr_size;
- if (avpkt->size < hdr_size * avctx->channels) {
- av_log(avctx, AV_LOG_ERROR, "packet size is too small\n");
- return AVERROR(EINVAL);
+ if (avpkt->size % avctx->channels) {
+ av_log(avctx, AV_LOG_WARNING, "Packet with odd size, ignoring last byte\n");
}
- if (esc->data[0]) {
- av_log(avctx, AV_LOG_ERROR, "unexpected data after first packet\n");
+ if (avpkt->size < (hdr_size + 1) * avctx->channels) {
+ av_log(avctx, AV_LOG_ERROR, "packet size is too small\n");
return AVERROR(EINVAL);
}
- if (is_compr) {
esc->fib_acc[0] = avpkt->data[1] + 128;
if (avctx->channels == 2)
esc->fib_acc[1] = avpkt->data[2+chan_size+1] + 128;
- }
esc->data_idx = 0;
esc->data_size = chan_size;
@@ -136,50 +135,37 @@ static int eightsvx_decode_frame(AVCodecContext *avctx, void *data,
}
/* get output buffer */
- frame->nb_samples = buf_size * (is_compr + 1);
- if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
- av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+ frame->nb_samples = buf_size * 2;
+ if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
return ret;
- }
for (ch = 0; ch < avctx->channels; ch++) {
- if (is_compr) {
- delta_decode(frame->data[ch], &esc->data[ch][esc->data_idx],
- buf_size, &esc->fib_acc[ch], esc->table);
- } else {
- raw_decode(frame->data[ch], &esc->data[ch][esc->data_idx],
- buf_size);
- }
+ delta_decode(frame->data[ch], &esc->data[ch][esc->data_idx],
+ buf_size, &esc->fib_acc[ch], esc->table);
}
esc->data_idx += buf_size;
*got_frame_ptr = 1;
- return avpkt->size;
+ return ((avctx->frame_number == 0)*hdr_size + buf_size)*avctx->channels;
}
-/** initialize 8svx decoder */
static av_cold int eightsvx_decode_init(AVCodecContext *avctx)
{
EightSvxContext *esc = avctx->priv_data;
if (avctx->channels < 1 || avctx->channels > 2) {
av_log(avctx, AV_LOG_ERROR, "8SVX does not support more than 2 channels\n");
- return AVERROR(EINVAL);
+ return AVERROR_INVALIDDATA;
}
- switch(avctx->codec->id) {
- case AV_CODEC_ID_8SVX_FIB:
- esc->table = fibonacci;
- break;
- case AV_CODEC_ID_8SVX_EXP:
- esc->table = exponential;
- break;
- case AV_CODEC_ID_PCM_S8_PLANAR:
- break;
- default:
- return -1;
+ switch (avctx->codec->id) {
+ case AV_CODEC_ID_8SVX_FIB: esc->table = fibonacci; break;
+ case AV_CODEC_ID_8SVX_EXP: esc->table = exponential; break;
+ default:
+ av_log(avctx, AV_LOG_ERROR, "Invalid codec id %d.\n", avctx->codec->id);
+ return AVERROR_INVALIDDATA;
}
avctx->sample_fmt = AV_SAMPLE_FMT_U8P;
@@ -192,10 +178,13 @@ static av_cold int eightsvx_decode_close(AVCodecContext *avctx)
av_freep(&esc->data[0]);
av_freep(&esc->data[1]);
+ esc->data_size = 0;
+ esc->data_idx = 0;
return 0;
}
+#if CONFIG_EIGHTSVX_FIB_DECODER
AVCodec ff_eightsvx_fib_decoder = {
.name = "8svx_fib",
.long_name = NULL_IF_CONFIG_SMALL("8SVX fibonacci"),
@@ -203,13 +192,14 @@ AVCodec ff_eightsvx_fib_decoder = {
.id = AV_CODEC_ID_8SVX_FIB,
.priv_data_size = sizeof (EightSvxContext),
.init = eightsvx_decode_init,
- .close = eightsvx_decode_close,
.decode = eightsvx_decode_frame,
- .capabilities = CODEC_CAP_DELAY | CODEC_CAP_DR1,
+ .close = eightsvx_decode_close,
+ .capabilities = CODEC_CAP_DR1,
.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_U8P,
AV_SAMPLE_FMT_NONE },
};
-
+#endif
+#if CONFIG_EIGHTSVX_EXP_DECODER
AVCodec ff_eightsvx_exp_decoder = {
.name = "8svx_exp",
.long_name = NULL_IF_CONFIG_SMALL("8SVX exponential"),
@@ -217,23 +207,10 @@ AVCodec ff_eightsvx_exp_decoder = {
.id = AV_CODEC_ID_8SVX_EXP,
.priv_data_size = sizeof (EightSvxContext),
.init = eightsvx_decode_init,
- .close = eightsvx_decode_close,
.decode = eightsvx_decode_frame,
- .capabilities = CODEC_CAP_DELAY | CODEC_CAP_DR1,
+ .close = eightsvx_decode_close,
+ .capabilities = CODEC_CAP_DR1,
.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_U8P,
AV_SAMPLE_FMT_NONE },
};
-
-AVCodec ff_pcm_s8_planar_decoder = {
- .name = "pcm_s8_planar",
- .long_name = NULL_IF_CONFIG_SMALL("PCM signed 8-bit planar"),
- .type = AVMEDIA_TYPE_AUDIO,
- .id = AV_CODEC_ID_PCM_S8_PLANAR,
- .priv_data_size = sizeof(EightSvxContext),
- .init = eightsvx_decode_init,
- .close = eightsvx_decode_close,
- .decode = eightsvx_decode_frame,
- .capabilities = CODEC_CAP_DELAY | CODEC_CAP_DR1,
- .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_U8P,
- AV_SAMPLE_FMT_NONE },
-};
+#endif
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-09 15:04:41 +0000