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Fix DPX decoder
Rewrite the DPX decoder to work with provided sample DPXs at http://samples.ffmpeg.org/image-samples/dpx_samples.zip The decoder could only decode 8 and 10 bit without alpha correctly, failing or even crashing at other flavors. This patch aims to fix these issues, properly decoding all variants of DPX provided in the referenced DPX sample zip. For 10 and 12 bit, the alpha channel is ignored, but decoding is still possible. Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
parent
cdfa926415
commit
05b7315412
168
libavcodec/dpx.c
168
libavcodec/dpx.c
@ -41,13 +41,27 @@ static unsigned int read32(const uint8_t **ptr, int is_big)
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return temp;
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}
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static uint16_t read10in32(const uint8_t **ptr, uint32_t * lbuf,
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int * n_datum, int is_big)
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{
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if (*n_datum)
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(*n_datum)--;
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else {
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*lbuf = read32(ptr, is_big);
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*n_datum = 2;
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}
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*lbuf = (*lbuf << 10) | (*lbuf >> 22);
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return *lbuf & 0x3FF;
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}
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static int decode_frame(AVCodecContext *avctx,
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void *data,
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int *data_size,
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AVPacket *avpkt)
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{
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const uint8_t *buf = avpkt->data;
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const uint8_t *buf_end = avpkt->data + avpkt->size;
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int buf_size = avpkt->size;
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DPXContext *const s = avctx->priv_data;
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AVFrame *picture = data;
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@ -57,10 +71,10 @@ static int decode_frame(AVCodecContext *avctx,
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unsigned int offset;
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int magic_num, endian;
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int x, y, i;
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int w, h, stride, bits_per_color, descriptor, elements, target_packet_size, source_packet_size;
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int planar;
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int w, h, bits_per_color, descriptor, elements, packing, total_size;
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unsigned int rgbBuffer;
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unsigned int rgbBuffer = 0;
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int n_datum = 0;
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if (avpkt->size <= 1634) {
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av_log(avctx, AV_LOG_ERROR, "Packet too small for DPX header\n");
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@ -99,8 +113,10 @@ static int decode_frame(AVCodecContext *avctx,
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buf += 3;
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avctx->bits_per_raw_sample =
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bits_per_color = buf[0];
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buf++;
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packing = *((uint16_t*)buf);
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buf += 825;
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buf += 824;
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avctx->sample_aspect_ratio.num = read32(&buf, endian);
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avctx->sample_aspect_ratio.den = read32(&buf, endian);
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if (avctx->sample_aspect_ratio.num > 0 && avctx->sample_aspect_ratio.den > 0)
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@ -129,25 +145,27 @@ static int decode_frame(AVCodecContext *avctx,
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} else {
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avctx->pix_fmt = AV_PIX_FMT_RGB24;
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}
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source_packet_size = elements;
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target_packet_size = elements;
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planar = 0;
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total_size = avctx->width * avctx->height * elements;
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break;
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case 10:
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if (!packing) {
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av_log(avctx, AV_LOG_ERROR, "Packing to 32bit required\n");
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return -1;
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}
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avctx->pix_fmt = AV_PIX_FMT_GBRP10;
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target_packet_size = 6;
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source_packet_size = 4;
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planar = 1;
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total_size = (4 * avctx->width * avctx->height * elements) / 3;
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break;
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case 12:
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if (endian) {
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avctx->pix_fmt = elements == 4 ? AV_PIX_FMT_GBRP12BE : AV_PIX_FMT_GBRP12BE;
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} else {
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avctx->pix_fmt = elements == 4 ? AV_PIX_FMT_GBRP12LE : AV_PIX_FMT_GBRP12LE;
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if (!packing) {
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av_log(avctx, AV_LOG_ERROR, "Packing to 16bit required\n");
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return -1;
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}
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target_packet_size = 6;
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source_packet_size = 6;
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planar = 1;
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if (endian) {
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avctx->pix_fmt = AV_PIX_FMT_GBRP12BE;
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} else {
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avctx->pix_fmt = AV_PIX_FMT_GBRP12LE;
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}
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total_size = 2 * avctx->width * avctx->height * elements;
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break;
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case 16:
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if (endian) {
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@ -155,9 +173,7 @@ static int decode_frame(AVCodecContext *avctx,
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} else {
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avctx->pix_fmt = elements == 4 ? AV_PIX_FMT_RGBA64LE : AV_PIX_FMT_RGB48LE;
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}
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target_packet_size =
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source_packet_size = elements * 2;
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planar = 0;
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total_size = 2 * avctx->width * avctx->height * elements;
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break;
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default:
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av_log(avctx, AV_LOG_ERROR, "Unsupported color depth : %d\n", bits_per_color);
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@ -180,68 +196,68 @@ static int decode_frame(AVCodecContext *avctx,
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for (i=0; i<AV_NUM_DATA_POINTERS; i++)
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ptr[i] = p->data[i];
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stride = p->linesize[0];
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if (source_packet_size*avctx->width*avctx->height > buf_end - buf) {
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if (total_size > avpkt->size) {
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av_log(avctx, AV_LOG_ERROR, "Overread buffer. Invalid header?\n");
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return -1;
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}
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switch (bits_per_color) {
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case 10:
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for (x = 0; x < avctx->height; x++) {
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uint16_t *dst[3] = {(uint16_t*)ptr[0],
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(uint16_t*)ptr[1],
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(uint16_t*)ptr[2]};
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for (y = 0; y < avctx->width; y++) {
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rgbBuffer = read32(&buf, endian);
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*dst[0]++ = (rgbBuffer >> 12) & 0x3FF;
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*dst[1]++ = (rgbBuffer >> 2) & 0x3FF;
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*dst[2]++ = (rgbBuffer >> 22) & 0x3FF;
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}
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for (i=0; i<3; i++)
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ptr[i] += p->linesize[i];
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case 10:
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for (x = 0; x < avctx->height; x++) {
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uint16_t *dst[3] = {(uint16_t*)ptr[0],
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(uint16_t*)ptr[1],
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(uint16_t*)ptr[2]};
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for (y = 0; y < avctx->width; y++) {
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*dst[2]++ = read10in32(&buf, &rgbBuffer,
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&n_datum, endian);
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*dst[0]++ = read10in32(&buf, &rgbBuffer,
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&n_datum, endian);
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*dst[1]++ = read10in32(&buf, &rgbBuffer,
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&n_datum, endian);
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// For 10 bit, ignore alpha
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if (elements == 4)
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read10in32(&buf, &rgbBuffer,
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&n_datum, endian);
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}
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break;
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case 8:
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case 12:
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case 16:
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if (planar) {
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int source_bpc = target_packet_size / elements;
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int target_bpc = target_packet_size / elements;
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for (x = 0; x < avctx->height; x++) {
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uint8_t *dst[AV_NUM_DATA_POINTERS];
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for (i=0; i<elements; i++)
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dst[i] = ptr[i];
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for (y = 0; y < avctx->width; y++) {
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for (i=0; i<3; i++) {
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memcpy(dst[i], buf, FFMIN(source_bpc, target_bpc));
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dst[i] += target_bpc;
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buf += source_bpc;
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}
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}
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for (i=0; i<elements; i++)
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ptr[i] += p->linesize[i];
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}
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} else {
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if (source_packet_size == target_packet_size) {
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for (x = 0; x < avctx->height; x++) {
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memcpy(ptr[0], buf, target_packet_size*avctx->width);
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ptr[0] += stride;
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buf += source_packet_size*avctx->width;
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}
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} else {
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for (x = 0; x < avctx->height; x++) {
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uint8_t *dst = ptr[0];
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for (y = 0; y < avctx->width; y++) {
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memcpy(dst, buf, target_packet_size);
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dst += target_packet_size;
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buf += source_packet_size;
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}
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ptr[0] += stride;
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}
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}
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for (i = 0; i < 3; i++)
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ptr[i] += p->linesize[i];
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}
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break;
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case 12:
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for (x = 0; x < avctx->height; x++) {
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uint16_t *dst[3] = {(uint16_t*)ptr[0],
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(uint16_t*)ptr[1],
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(uint16_t*)ptr[2]};
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for (y = 0; y < avctx->width; y++) {
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*dst[2] = *((uint16_t*)buf);
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*dst[2] = (*dst[2] >> 4) | (*dst[2] << 12);
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dst[2]++;
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buf += 2;
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*dst[0] = *((uint16_t*)buf);
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*dst[0] = (*dst[0] >> 4) | (*dst[0] << 12);
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dst[0]++;
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buf += 2;
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*dst[1] = *((uint16_t*)buf);
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*dst[1] = (*dst[1] >> 4) | (*dst[1] << 12);
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dst[1]++;
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buf += 2;
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// For 12 bit, ignore alpha
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if (elements == 4)
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buf += 2;
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}
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break;
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for (i = 0; i < 3; i++)
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ptr[i] += p->linesize[i];
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}
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break;
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case 16:
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elements *= 2;
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case 8:
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for (x = 0; x < avctx->height; x++) {
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memcpy(ptr[0], buf, elements*avctx->width);
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ptr[0] += p->linesize[0];
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buf += elements*avctx->width;
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}
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break;
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}
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*picture = s->picture;
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