static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
AVPacket *avpkt) {
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
CamStudioContext *c = avctx->priv_data;
AVFrame *picture = data;
int ret;
if (buf_size < 2) {
av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
return AVERROR_INVALIDDATA;
}
if ((ret = ff_get_buffer(avctx, picture, 0)) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return ret;
}
// decompress data
switch ((buf[0] >> 1) & 7) {
case 0: { // lzo compression
int outlen = c->decomp_size, inlen = buf_size - 2;
if (av_lzo1x_decode(c->decomp_buf, &outlen, &buf[2], &inlen))
av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
break;
}
case 1: { // zlib compression
#if CONFIG_ZLIB
unsigned long dlen = c->decomp_size;
if (uncompress(c->decomp_buf, &dlen, &buf[2], buf_size - 2) != Z_OK)
av_log(avctx, AV_LOG_ERROR, "error during zlib decompression\n");
break;
#else
av_log(avctx, AV_LOG_ERROR, "compiled without zlib support\n");
return AVERROR(ENOSYS);
#endif
}
default:
av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
return AVERROR_INVALIDDATA;
}
// flip upside down, add difference frame
if (buf[0] & 1) { // keyframe
picture->pict_type = AV_PICTURE_TYPE_I;
picture->key_frame = 1;
switch (c->bpp) {
case 16:
copy_frame_16(picture, c->decomp_buf, c->linelen, c->height);
break;
case 32:
copy_frame_32(picture, c->decomp_buf, c->linelen, c->height);
break;
default:
copy_frame_default(picture, c->decomp_buf, FFALIGN(c->linelen, 4),
c->linelen, c->height);
}
} else {
picture->pict_type = AV_PICTURE_TYPE_P;
picture->key_frame = 0;
switch (c->bpp) {
case 16:
add_frame_16(picture, c->decomp_buf, c->linelen, c->height);
break;
case 32:
add_frame_32(picture, c->decomp_buf, c->linelen, c->height);
break;
default:
add_frame_default(picture, c->decomp_buf, FFALIGN(c->linelen, 4),
c->linelen, c->height);
}
}
*got_frame = 1;
return buf_size;
}
static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
const uint8_t *buf, int buf_size) {
CamStudioContext *c = avctx->priv_data;
AVFrame *picture = data;
if (buf_size < 2) {
av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
return -1;
}
if (c->pic.data[0])
avctx->release_buffer(avctx, &c->pic);
c->pic.reference = 1;
c->pic.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_READABLE |
FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
if (avctx->get_buffer(avctx, &c->pic) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return -1;
}
// decompress data
switch ((buf[0] >> 1) & 7) {
case 0: { // lzo compression
int outlen = c->decomp_size, inlen = buf_size - 2;
if (lzo1x_decode(c->decomp_buf, &outlen, &buf[2], &inlen))
av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
break;
}
case 1: { // zlib compression
#ifdef CONFIG_ZLIB
unsigned long dlen = c->decomp_size;
if (uncompress(c->decomp_buf, &dlen, &buf[2], buf_size - 2) != Z_OK)
av_log(avctx, AV_LOG_ERROR, "error during zlib decompression\n");
break;
#else
av_log(avctx, AV_LOG_ERROR, "compiled without zlib support\n");
return -1;
#endif
}
default:
av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
return -1;
}
// flip upside down, add difference frame
if (buf[0] & 1) { // keyframe
c->pic.pict_type = FF_I_TYPE;
c->pic.key_frame = 1;
switch (c->bpp) {
case 16:
copy_frame_16(&c->pic, c->decomp_buf, c->linelen, c->height);
break;
case 32:
copy_frame_32(&c->pic, c->decomp_buf, c->linelen, c->height);
break;
default:
copy_frame_default(&c->pic, c->decomp_buf, c->linelen, c->height);
}
} else {
c->pic.pict_type = FF_P_TYPE;
c->pic.key_frame = 0;
switch (c->bpp) {
case 16:
add_frame_16(&c->pic, c->decomp_buf, c->linelen, c->height);
break;
case 32:
add_frame_32(&c->pic, c->decomp_buf, c->linelen, c->height);
break;
default:
add_frame_default(&c->pic, c->decomp_buf, c->linelen, c->height);
}
}
*picture = c->pic;
*data_size = sizeof(AVFrame);
return buf_size;
}