* 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
*/
#include <stdlib.h>
#include <string.h>
+#include "libavutil/common.h"
#include "libavutil/intreadwrite.h"
#include "avcodec.h"
#define QUEUE_SIZE 0x1000
#define QUEUE_MASK 0x0FFF
-static void lz_unpack(const unsigned char *src, unsigned char *dest, int dest_len)
+static void lz_unpack(const unsigned char *src, int src_len,
+ unsigned char *dest, int dest_len)
{
const unsigned char *s;
+ unsigned int s_len;
unsigned char *d;
unsigned char *d_end;
unsigned char queue[QUEUE_SIZE];
unsigned int i, j;
s = src;
+ s_len = src_len;
d = dest;
d_end = d + dest_len;
dataleft = AV_RL32(s);
- s += 4;
+ s += 4; s_len -= 4;
memset(queue, 0x20, QUEUE_SIZE);
+ if (s_len < 4)
+ return;
if (AV_RL32(s) == 0x56781234) {
- s += 4;
+ s += 4; s_len -= 4;
qpos = 0x111;
speclen = 0xF + 3;
} else {
speclen = 100; /* no speclen */
}
- while (dataleft > 0) {
- tag = *s++;
+ while (dataleft > 0 && s_len > 0) {
+ tag = *s++; s_len--;
if ((tag == 0xFF) && (dataleft > 8)) {
- if (d + 8 > d_end)
+ if (d + 8 > d_end || s_len < 8)
return;
for (i = 0; i < 8; i++) {
queue[qpos++] = *d++ = *s++;
qpos &= QUEUE_MASK;
}
+ s_len -= 8;
dataleft -= 8;
} else {
for (i = 0; i < 8; i++) {
if (dataleft == 0)
break;
if (tag & 0x01) {
- if (d + 1 > d_end)
+ if (d + 1 > d_end || s_len < 1)
return;
queue[qpos++] = *d++ = *s++;
qpos &= QUEUE_MASK;
dataleft--;
+ s_len--;
} else {
+ if (s_len < 2)
+ return;
chainofs = *s++;
chainofs |= ((*s & 0xF0) << 4);
chainlen = (*s++ & 0x0F) + 3;
- if (chainlen == speclen)
+ s_len -= 2;
+ if (chainlen == speclen) {
+ if (s_len < 1)
+ return;
chainlen = *s++ + 0xF + 3;
+ s_len--;
+ }
if (d + chainlen > d_end)
return;
for (j = 0; j < chainlen; j++) {
}
static int rle_unpack(const unsigned char *src, unsigned char *dest,
- int src_len, int dest_len)
+ int src_count, int src_size, int dest_len)
{
const unsigned char *ps;
unsigned char *pd;
ps = src;
pd = dest;
- if (src_len & 1)
+ if (src_count & 1) {
+ if (src_size < 1)
+ return 0;
*pd++ = *ps++;
+ src_size--;
+ }
- src_len >>= 1;
+ src_count >>= 1;
i = 0;
do {
+ if (src_size < 1)
+ break;
l = *ps++;
+ src_size--;
if (l & 0x80) {
l = (l & 0x7F) * 2;
- if (pd + l > dest_end)
+ if (pd + l > dest_end || src_size < l)
return ps - src;
memcpy(pd, ps, l);
ps += l;
+ src_size -= l;
pd += l;
} else {
- if (pd + i > dest_end)
+ if (pd + i > dest_end || src_size < 2)
return ps - src;
for (i = 0; i < l; i++) {
*pd++ = ps[0];
*pd++ = ps[1];
}
ps += 2;
+ src_size -= 2;
}
i += l;
- } while (i < src_len);
+ } while (i < src_count);
return ps - src;
}
const unsigned char *p = s->buf + 16;
const unsigned char *pb;
+ unsigned int pb_size;
unsigned char meth;
unsigned char *dp; /* pointer to current frame */
unsigned char *pp; /* pointer to previous frame */
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]);
frame_width = AV_RL16(&s->buf[10]) - frame_x + 1;
frame_height = AV_RL16(&s->buf[12]) - frame_y + 1;
+ if (frame_x < 0 || frame_width < 0 ||
+ frame_x >= s->avctx->width ||
+ frame_width > s->avctx->width ||
+ frame_x + frame_width > s->avctx->width)
+ return;
+ if (frame_y < 0 || frame_height < 0 ||
+ frame_y >= s->avctx->height ||
+ frame_height > s->avctx->height ||
+ frame_y + frame_height > s->avctx->height)
+ return;
if ((frame_width == s->avctx->width && frame_height == s->avctx->height) &&
(frame_x || frame_y)) {
/* if only a certain region will be updated, copy the entire previous
* frame before the decode */
- if (frame_x || frame_y || (frame_width != s->avctx->width) ||
- (frame_height != s->avctx->height)) {
+ if (s->prev_frame.data[0] &&
+ (frame_x || frame_y || (frame_width != s->avctx->width) ||
+ (frame_height != s->avctx->height))) {
memcpy(s->frame.data[0], s->prev_frame.data[0],
s->avctx->height * s->frame.linesize[0]);
}
s->size -= (256 * 3 + 2);
}
- if (s->size >= 0) {
+ if (s->size > 0) {
/* originally UnpackFrame in VAG's code */
pb = p;
- meth = *pb++;
+ pb_size = s->buf + s->size - pb;
+ if (pb_size < 1)
+ return;
+ meth = *pb++; pb_size--;
if (meth & 0x80) {
- lz_unpack(pb, s->unpack_buffer, s->unpack_buffer_size);
+ lz_unpack(pb, pb_size,
+ s->unpack_buffer, s->unpack_buffer_size);
meth &= 0x7F;
pb = s->unpack_buffer;
+ pb_size = s->unpack_buffer_size;
}
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:
for (i = 0; i < frame_height; i++) {
ofs = 0;
do {
+ if (pb_size < 1)
+ return;
len = *pb++;
+ pb_size--;
if (len & 0x80) {
len = (len & 0x7F) + 1;
- if (ofs + len > frame_width)
+ if (ofs + len > frame_width || pb_size < len)
return;
memcpy(&dp[ofs], pb, len);
pb += len;
+ pb_size -= len;
ofs += len;
} else {
/* interframe pixel copy */
- if (ofs + len + 1 > frame_width)
+ if (ofs + len + 1 > frame_width || !s->prev_frame.data[0])
return;
memcpy(&dp[ofs], &pp[ofs], len + 1);
ofs += len + 1;
case 2:
for (i = 0; i < frame_height; i++) {
+ if (pb_size < frame_width)
+ return;
memcpy(dp, pb, frame_width);
pb += frame_width;
+ pb_size -= frame_width;
dp += s->frame.linesize[0];
pp += s->prev_frame.linesize[0];
}
for (i = 0; i < frame_height; i++) {
ofs = 0;
do {
+ if (pb_size < 1)
+ return;
len = *pb++;
+ pb_size--;
if (len & 0x80) {
len = (len & 0x7F) + 1;
+ if (pb_size < 1)
+ return;
if (*pb++ == 0xFF)
- len = rle_unpack(pb, &dp[ofs], len, frame_width - ofs);
- else
+ len = rle_unpack(pb, &dp[ofs], len, pb_size, frame_width - ofs);
+ else {
+ if (pb_size < len)
+ return;
memcpy(&dp[ofs], pb, len);
+ }
pb += len;
+ pb_size -= 1 + len;
ofs += len;
} else {
/* interframe pixel copy */
- if (ofs + len + 1 > frame_width)
+ if (ofs + len + 1 > frame_width || !s->prev_frame.data[0])
return;
memcpy(&dp[ofs], &pp[ofs], len + 1);
ofs += len + 1;
unsigned char *raw_palette;
s->avctx = avctx;
- avctx->pix_fmt = PIX_FMT_PAL8;
+ avctx->pix_fmt = AV_PIX_FMT_PAL8;
/* make sure the VMD header made it */
if (s->avctx->extradata_size != VMD_HEADER_SIZE) {
* 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 predictors[2];
+ AVFrame frame;
+ int out_bps;
+ int chunk_size;
} VmdAudioContext;
static const uint16_t vmdaudio_table[128] = {
{
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 = AV_SAMPLE_FMT_S16;
+ if (avctx->channels < 1 || avctx->channels > 2) {
+ av_log(avctx, AV_LOG_ERROR, "invalid number of channels\n");
+ return AVERROR(EINVAL);
+ }
+ if (avctx->block_align < 1) {
+ av_log(avctx, AV_LOG_ERROR, "invalid block align\n");
+ return AVERROR(EINVAL);
+ }
- 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);
+ 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);
+
+ s->chunk_size = avctx->block_align + avctx->channels * (s->out_bps == 2);
+
+ avcodec_get_frame_defaults(&s->frame);
+ avctx->coded_frame = &s->frame;
+
+ 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 void vmdaudio_decode_audio(VmdAudioContext *s, unsigned char *data,
- const uint8_t *buf, int buf_size, int stereo)
+static void decode_audio_s16(int16_t *out, const uint8_t *buf, int buf_size,
+ int channels)
{
- int i;
- int chan = 0;
- int16_t *out = (int16_t*)data;
+ int ch;
+ const uint8_t *buf_end = buf + buf_size;
+ int predictor[2];
+ int st = channels - 1;
+
+ /* decode initial raw sample */
+ for (ch = 0; ch < channels; ch++) {
+ predictor[ch] = (int16_t)AV_RL16(buf);
+ buf += 2;
+ *out++ = predictor[ch];
+ }
- for(i = 0; i < buf_size; i++) {
- if(buf[i] & 0x80)
- s->predictors[chan] -= vmdaudio_table[buf[i] & 0x7F];
+ /* decode DPCM samples */
+ ch = 0;
+ while (buf < buf_end) {
+ uint8_t b = *buf++;
+ if (b & 0x80)
+ predictor[ch] -= vmdaudio_table[b & 0x7F];
else
- s->predictors[chan] += vmdaudio_table[buf[i]];
- s->predictors[chan] = av_clip_int16(s->predictors[chan]);
- out[i] = s->predictors[chan];
- chan ^= stereo;
+ predictor[ch] += vmdaudio_table[b];
+ predictor[ch] = av_clip_int16(predictor[ch]);
+ *out++ = predictor[ch];
+ ch ^= st;
}
}
-static int vmdaudio_loadsound(VmdAudioContext *s, unsigned char *data,
- const uint8_t *buf, int silence, int data_size)
+static int vmdaudio_decode_frame(AVCodecContext *avctx, void *data,
+ int *got_frame_ptr, AVPacket *avpkt)
{
- int bytes_decoded = 0;
- int i;
+ const uint8_t *buf = avpkt->data;
+ const uint8_t *buf_end;
+ int buf_size = avpkt->size;
+ VmdAudioContext *s = avctx->priv_data;
+ int block_type, silent_chunks, audio_chunks;
+ int ret;
+ uint8_t *output_samples_u8;
+ int16_t *output_samples_s16;
+
+ if (buf_size < 16) {
+ av_log(avctx, AV_LOG_WARNING, "skipping small junk packet\n");
+ *got_frame_ptr = 0;
+ return buf_size;
+ }
-// if (silence)
-// av_log(s->avctx, AV_LOG_INFO, "silent block!\n");
- if (s->channels == 2) {
+ 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;
+
+ /* get number of silent chunks */
+ silent_chunks = 0;
+ if (block_type == BLOCK_TYPE_INITIAL) {
+ uint32_t flags;
+ if (buf_size < 4) {
+ av_log(avctx, AV_LOG_ERROR, "packet is too small\n");
+ return AVERROR(EINVAL);
+ }
+ 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
+ }
+
+ /* ensure output buffer is large enough */
+ audio_chunks = buf_size / s->chunk_size;
- /* stereo handling */
- if (silence) {
- memset(data, 0, data_size * 2);
+ /* get output buffer */
+ s->frame.nb_samples = ((silent_chunks + audio_chunks) * avctx->block_align) / avctx->channels;
+ if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) {
+ av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+ return ret;
+ }
+ output_samples_u8 = s->frame.data[0];
+ output_samples_s16 = (int16_t *)s->frame.data[0];
+
+ /* decode silent chunks */
+ if (silent_chunks > 0) {
+ int silent_size = avctx->block_align * silent_chunks;
+ if (s->out_bps == 2) {
+ memset(output_samples_s16, 0x00, silent_size * 2);
+ output_samples_s16 += silent_size;
} 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;
- }
- }
+ memset(output_samples_u8, 0x80, silent_size);
+ output_samples_u8 += silent_size;
}
- } else {
- bytes_decoded = data_size * 2;
+ }
- /* mono handling */
- if (silence) {
- memset(data, 0, data_size * 2);
- } else {
- if (s->bits == 16) {
- vmdaudio_decode_audio(s, data, buf, data_size, 0);
+ /* decode audio chunks */
+ if (audio_chunks > 0) {
+ buf_end = buf + buf_size;
+ while (buf < buf_end) {
+ if (s->out_bps == 2) {
+ decode_audio_s16(output_samples_s16, buf, s->chunk_size,
+ avctx->channels);
+ output_samples_s16 += avctx->block_align;
} else {
- /* copy the data but convert it to signed */
- for (i = 0; i < data_size; i++){
- *data++ = buf[i] + 0x80;
- *data++ = buf[i] + 0x80;
- }
+ memcpy(output_samples_u8, buf, s->chunk_size);
+ output_samples_u8 += avctx->block_align;
}
+ buf += s->chunk_size;
}
}
- return data_size * 2;
-}
-
-static int vmdaudio_decode_frame(AVCodecContext *avctx,
- void *data, int *data_size,
- AVPacket *avpkt)
-{
- const uint8_t *buf = avpkt->data;
- int buf_size = avpkt->size;
- VmdAudioContext *s = avctx->priv_data;
- unsigned char *output_samples = (unsigned char *)data;
-
- /* point to the start of the encoded data */
- const unsigned char *p = buf + 16;
+ *got_frame_ptr = 1;
+ *(AVFrame *)data = s->frame;
- if (buf_size < 16)
- 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);
- }
-
- return buf_size;
+ return avpkt->size;
}
*/
AVCodec ff_vmdvideo_decoder = {
- "vmdvideo",
- AVMEDIA_TYPE_VIDEO,
- CODEC_ID_VMDVIDEO,
- sizeof(VmdVideoContext),
- vmdvideo_decode_init,
- NULL,
- vmdvideo_decode_end,
- vmdvideo_decode_frame,
- CODEC_CAP_DR1,
- .long_name = NULL_IF_CONFIG_SMALL("Sierra VMD video"),
+ .name = "vmdvideo",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_VMDVIDEO,
+ .priv_data_size = sizeof(VmdVideoContext),
+ .init = vmdvideo_decode_init,
+ .close = vmdvideo_decode_end,
+ .decode = vmdvideo_decode_frame,
+ .capabilities = CODEC_CAP_DR1,
+ .long_name = NULL_IF_CONFIG_SMALL("Sierra VMD video"),
};
AVCodec ff_vmdaudio_decoder = {
- "vmdaudio",
- AVMEDIA_TYPE_AUDIO,
- CODEC_ID_VMDAUDIO,
- sizeof(VmdAudioContext),
- vmdaudio_decode_init,
- NULL,
- NULL,
- vmdaudio_decode_frame,
- .long_name = NULL_IF_CONFIG_SMALL("Sierra VMD audio"),
+ .name = "vmdaudio",
+ .type = AVMEDIA_TYPE_AUDIO,
+ .id = AV_CODEC_ID_VMDAUDIO,
+ .priv_data_size = sizeof(VmdAudioContext),
+ .init = vmdaudio_decode_init,
+ .decode = vmdaudio_decode_frame,
+ .capabilities = CODEC_CAP_DR1,
+ .long_name = NULL_IF_CONFIG_SMALL("Sierra VMD audio"),
};
projects / ffmpeg / blobdiff