/*
* Assorted DPCM codecs
- * Copyright (c) 2003 The ffmpeg Project.
+ * Copyright (c) 2003 The ffmpeg Project
*
* This file is part of FFmpeg.
*
*/
/**
- * @file: dpcm.c
+ * @file
* Assorted DPCM (differential pulse code modulation) audio codecs
* by Mike Melanson (melanson@pcisys.net)
* Xan DPCM decoder by Mario Brito (mbrito@student.dei.uc.pt)
* the fourcc 'Axan' in the 'auds' chunk of the AVI header.
*/
+#include "libavutil/intreadwrite.h"
#include "avcodec.h"
typedef struct DPCMContext {
#define SE_16BIT(x) if (x & 0x8000) x -= 0x10000;
-static int interplay_delta_table[] = {
+static const int interplay_delta_table[] = {
0, 1, 2, 3, 4, 5, 6, 7,
8, 9, 10, 11, 12, 13, 14, 15,
16, 17, 18, 19, 20, 21, 22, 23,
-static int dpcm_decode_init(AVCodecContext *avctx)
+static av_cold int dpcm_decode_init(AVCodecContext *avctx)
{
DPCMContext *s = avctx->priv_data;
int i;
break;
}
+ avctx->sample_fmt = AV_SAMPLE_FMT_S16;
return 0;
}
static int dpcm_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
- uint8_t *buf, int buf_size)
+ AVPacket *avpkt)
{
+ const uint8_t *buf = avpkt->data;
+ int buf_size = avpkt->size;
DPCMContext *s = avctx->priv_data;
int in, out = 0;
int predictor[2];
if (!buf_size)
return 0;
+ // almost every DPCM variant expands one byte of data into two
+ if(*data_size/2 < buf_size)
+ return -1;
+
switch(avctx->codec->id) {
case CODEC_ID_ROQ_DPCM:
case CODEC_ID_SOL_DPCM:
in = 0;
if (avctx->codec_tag != 3) {
+ if(*data_size/4 < buf_size)
+ return -1;
while (in < buf_size) {
int n1, n2;
n1 = (buf[in] >> 4) & 0xF;
n2 = buf[in++] & 0xF;
s->sample[0] += s->sol_table[n1];
- if (s->sample[0] < 0) s->sample[0] = 0;
+ if (s->sample[0] < 0) s->sample[0] = 0;
if (s->sample[0] > 255) s->sample[0] = 255;
output_samples[out++] = (s->sample[0] - 128) << 8;
s->sample[s->channels - 1] += s->sol_table[n2];
return buf_size;
}
-AVCodec roq_dpcm_decoder = {
- "roq_dpcm",
- CODEC_TYPE_AUDIO,
- CODEC_ID_ROQ_DPCM,
- sizeof(DPCMContext),
- dpcm_decode_init,
- NULL,
- NULL,
- dpcm_decode_frame,
-};
-
-AVCodec interplay_dpcm_decoder = {
- "interplay_dpcm",
- CODEC_TYPE_AUDIO,
- CODEC_ID_INTERPLAY_DPCM,
- sizeof(DPCMContext),
- dpcm_decode_init,
- NULL,
- NULL,
- dpcm_decode_frame,
+#define DPCM_DECODER(id, name, long_name_) \
+AVCodec name ## _decoder = { \
+ #name, \
+ AVMEDIA_TYPE_AUDIO, \
+ id, \
+ sizeof(DPCMContext), \
+ dpcm_decode_init, \
+ NULL, \
+ NULL, \
+ dpcm_decode_frame, \
+ .long_name = NULL_IF_CONFIG_SMALL(long_name_), \
};
-AVCodec xan_dpcm_decoder = {
- "xan_dpcm",
- CODEC_TYPE_AUDIO,
- CODEC_ID_XAN_DPCM,
- sizeof(DPCMContext),
- dpcm_decode_init,
- NULL,
- NULL,
- dpcm_decode_frame,
-};
-
-AVCodec sol_dpcm_decoder = {
- "sol_dpcm",
- CODEC_TYPE_AUDIO,
- CODEC_ID_SOL_DPCM,
- sizeof(DPCMContext),
- dpcm_decode_init,
- NULL,
- NULL,
- dpcm_decode_frame,
-};
+DPCM_DECODER(CODEC_ID_INTERPLAY_DPCM, interplay_dpcm, "DPCM Interplay");
+DPCM_DECODER(CODEC_ID_ROQ_DPCM, roq_dpcm, "DPCM id RoQ");
+DPCM_DECODER(CODEC_ID_SOL_DPCM, sol_dpcm, "DPCM Sol");
+DPCM_DECODER(CODEC_ID_XAN_DPCM, xan_dpcm, "DPCM Xan");