* Sierra VMD Audio & Video Decoders
* Copyright (C) 2004 the ffmpeg project
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * 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.
*
- * FFmpeg is distributed in the hope that it will be useful,
+ * 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 FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
- * @file libavcodec/vmdav.c
+ * @file
* Sierra VMD audio & video decoders
* by Vladimir "VAG" Gneushev (vagsoft at mail.ru)
* for more information on the Sierra VMD format, visit:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
-#include <unistd.h>
#include "libavutil/intreadwrite.h"
#include "avcodec.h"
int frame_x, frame_y;
int frame_width, frame_height;
- int dp_size;
frame_x = AV_RL16(&s->buf[6]);
frame_y = AV_RL16(&s->buf[8]);
}
dp = &s->frame.data[0][frame_y * s->frame.linesize[0] + frame_x];
- dp_size = s->frame.linesize[0] * s->avctx->height;
pp = &s->prev_frame.data[0][frame_y * s->prev_frame.linesize[0] + frame_x];
switch (meth) {
case 1:
palette32[i] = (r << 16) | (g << 8) | (b);
}
- s->frame.data[0] = s->prev_frame.data[0] = NULL;
-
return 0;
}
* Audio Decoder
*/
+#define BLOCK_TYPE_AUDIO 1
+#define BLOCK_TYPE_INITIAL 2
+#define BLOCK_TYPE_SILENCE 3
+
typedef struct VmdAudioContext {
AVCodecContext *avctx;
- int channels;
- int bits;
- int block_align;
+ int out_bps;
int predictors[2];
} VmdAudioContext;
VmdAudioContext *s = avctx->priv_data;
s->avctx = avctx;
- s->channels = avctx->channels;
- s->bits = avctx->bits_per_coded_sample;
- s->block_align = avctx->block_align;
- avctx->sample_fmt = SAMPLE_FMT_S16;
+ if (avctx->bits_per_coded_sample == 16)
+ avctx->sample_fmt = AV_SAMPLE_FMT_S16;
+ else
+ avctx->sample_fmt = AV_SAMPLE_FMT_U8;
+ s->out_bps = av_get_bytes_per_sample(avctx->sample_fmt);
- av_log(s->avctx, AV_LOG_DEBUG, "%d channels, %d bits/sample, block align = %d, sample rate = %d\n",
- s->channels, s->bits, s->block_align, avctx->sample_rate);
+ av_log(avctx, AV_LOG_DEBUG, "%d channels, %d bits/sample, "
+ "block align = %d, sample rate = %d\n",
+ avctx->channels, avctx->bits_per_coded_sample, avctx->block_align,
+ avctx->sample_rate);
return 0;
}
}
static int vmdaudio_loadsound(VmdAudioContext *s, unsigned char *data,
- const uint8_t *buf, int silence, int data_size)
+ const uint8_t *buf, int silent_chunks, int data_size)
{
- int bytes_decoded = 0;
- int i;
-
-// if (silence)
-// av_log(s->avctx, AV_LOG_INFO, "silent block!\n");
- if (s->channels == 2) {
-
- /* stereo handling */
- if (silence) {
- memset(data, 0, data_size * 2);
- } else {
- if (s->bits == 16)
- vmdaudio_decode_audio(s, data, buf, data_size, 1);
- else {
- /* copy the data but convert it to signed */
- for (i = 0; i < data_size; i++){
- *data++ = buf[i] + 0x80;
- *data++ = buf[i] + 0x80;
- }
- }
- }
- } else {
- bytes_decoded = data_size * 2;
+ int silent_size = s->avctx->block_align * silent_chunks * s->out_bps;
- /* mono handling */
- if (silence) {
- memset(data, 0, data_size * 2);
- } else {
- if (s->bits == 16) {
- vmdaudio_decode_audio(s, data, buf, data_size, 0);
- } else {
- /* copy the data but convert it to signed */
- for (i = 0; i < data_size; i++){
- *data++ = buf[i] + 0x80;
- *data++ = buf[i] + 0x80;
- }
- }
- }
+ if (silent_chunks) {
+ memset(data, s->out_bps == 2 ? 0x00 : 0x80, silent_size);
+ data += silent_size;
+ }
+ if (s->avctx->bits_per_coded_sample == 16)
+ vmdaudio_decode_audio(s, data, buf, data_size, s->avctx->channels == 2);
+ else {
+ /* just copy the data */
+ memcpy(data, buf, data_size);
}
- return data_size * 2;
+ return silent_size + data_size * s->out_bps;
}
static int vmdaudio_decode_frame(AVCodecContext *avctx,
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
VmdAudioContext *s = avctx->priv_data;
+ int block_type, silent_chunks;
unsigned char *output_samples = (unsigned char *)data;
- /* point to the start of the encoded data */
- const unsigned char *p = buf + 16;
-
- if (buf_size < 16)
+ if (buf_size < 16) {
+ av_log(avctx, AV_LOG_WARNING, "skipping small junk packet\n");
+ *data_size = 0;
return buf_size;
+ }
- if (buf[6] == 1) {
- /* the chunk contains audio */
- *data_size = vmdaudio_loadsound(s, output_samples, p, 0, buf_size - 16);
- } else if (buf[6] == 2) {
- /* initial chunk, may contain audio and silence */
- uint32_t flags = AV_RB32(p);
- int raw_block_size = s->block_align * s->bits / 8;
- int silent_chunks;
- if(flags == 0xFFFFFFFF)
- silent_chunks = 32;
- else
- silent_chunks = av_log2(flags + 1);
- if(*data_size < (s->block_align*silent_chunks + buf_size - 20) * 2)
- return -1;
- *data_size = 0;
- memset(output_samples, 0, raw_block_size * silent_chunks);
- output_samples += raw_block_size * silent_chunks;
- *data_size = raw_block_size * silent_chunks;
- *data_size += vmdaudio_loadsound(s, output_samples, p + 4, 0, buf_size - 20);
- } else if (buf[6] == 3) {
- /* silent chunk */
- *data_size = vmdaudio_loadsound(s, output_samples, p, 1, 0);
+ block_type = buf[6];
+ if (block_type < BLOCK_TYPE_AUDIO || block_type > BLOCK_TYPE_SILENCE) {
+ av_log(avctx, AV_LOG_ERROR, "unknown block type: %d\n", block_type);
+ return AVERROR(EINVAL);
+ }
+ buf += 16;
+ buf_size -= 16;
+
+ silent_chunks = 0;
+ if (block_type == BLOCK_TYPE_INITIAL) {
+ uint32_t flags = AV_RB32(buf);
+ silent_chunks = av_popcount(flags);
+ buf += 4;
+ buf_size -= 4;
+ } else if (block_type == BLOCK_TYPE_SILENCE) {
+ silent_chunks = 1;
+ buf_size = 0; // should already be zero but set it just to be sure
}
- return buf_size;
+ /* ensure output buffer is large enough */
+ if (*data_size < (avctx->block_align*silent_chunks + buf_size) * s->out_bps)
+ return -1;
+
+ *data_size = vmdaudio_loadsound(s, output_samples, buf, silent_chunks, buf_size);
+
+ return avpkt->size;
}
* Public Data Structures
*/
-AVCodec vmdvideo_decoder = {
+AVCodec ff_vmdvideo_decoder = {
"vmdvideo",
- CODEC_TYPE_VIDEO,
+ AVMEDIA_TYPE_VIDEO,
CODEC_ID_VMDVIDEO,
sizeof(VmdVideoContext),
vmdvideo_decode_init,
.long_name = NULL_IF_CONFIG_SMALL("Sierra VMD video"),
};
-AVCodec vmdaudio_decoder = {
+AVCodec ff_vmdaudio_decoder = {
"vmdaudio",
- CODEC_TYPE_AUDIO,
+ AVMEDIA_TYPE_AUDIO,
CODEC_ID_VMDAUDIO,
sizeof(VmdAudioContext),
vmdaudio_decode_init,
projects / ffmpeg / blobdiff