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https://git.ffmpeg.org/ffmpeg.git
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avcodec/flicvideo: add support for 24bit flic files
Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol
parent
54b5cc035a
commit
5781c983d8
@ -133,9 +133,7 @@ static av_cold int flic_decode_init(AVCodecContext *avctx)
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case 8 : avctx->pix_fmt = AV_PIX_FMT_PAL8; break;
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case 15 : avctx->pix_fmt = AV_PIX_FMT_RGB555; break;
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case 16 : avctx->pix_fmt = AV_PIX_FMT_RGB565; break;
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case 24 : avctx->pix_fmt = AV_PIX_FMT_BGR24; /* Supposedly BGR, but no files to test with */
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avpriv_request_sample(avctx, "24Bpp FLC/FLX");
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return AVERROR_PATCHWELCOME;
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case 24 : avctx->pix_fmt = AV_PIX_FMT_BGR24; break;
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default :
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av_log(avctx, AV_LOG_ERROR, "Unknown FLC/FLX depth of %d Bpp is unsupported.\n",depth);
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return AVERROR_INVALIDDATA;
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@ -767,8 +765,274 @@ static int flic_decode_frame_24BPP(AVCodecContext *avctx,
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void *data, int *got_frame,
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const uint8_t *buf, int buf_size)
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{
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av_log(avctx, AV_LOG_ERROR, "24Bpp FLC Unsupported due to lack of test files.\n");
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return AVERROR_PATCHWELCOME;
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FlicDecodeContext *s = avctx->priv_data;
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GetByteContext g2;
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int pixel_ptr;
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unsigned char palette_idx1;
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unsigned int frame_size;
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int num_chunks;
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unsigned int chunk_size;
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int chunk_type;
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int i, j, ret;
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int lines;
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int compressed_lines;
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signed short line_packets;
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int y_ptr;
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int byte_run;
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int pixel_skip;
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int pixel_countdown;
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unsigned char *pixels;
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int pixel;
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unsigned int pixel_limit;
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bytestream2_init(&g2, buf, buf_size);
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if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
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return ret;
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pixels = s->frame->data[0];
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pixel_limit = s->avctx->height * s->frame->linesize[0];
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frame_size = bytestream2_get_le32(&g2);
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bytestream2_skip(&g2, 2); /* skip the magic number */
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num_chunks = bytestream2_get_le16(&g2);
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bytestream2_skip(&g2, 8); /* skip padding */
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if (frame_size > buf_size)
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frame_size = buf_size;
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frame_size -= 16;
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/* iterate through the chunks */
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while ((frame_size > 0) && (num_chunks > 0) &&
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bytestream2_get_bytes_left(&g2) >= 4) {
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int stream_ptr_after_chunk;
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chunk_size = bytestream2_get_le32(&g2);
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if (chunk_size > frame_size) {
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av_log(avctx, AV_LOG_WARNING,
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"Invalid chunk_size = %u > frame_size = %u\n", chunk_size, frame_size);
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chunk_size = frame_size;
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}
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stream_ptr_after_chunk = bytestream2_tell(&g2) - 4 + chunk_size;
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chunk_type = bytestream2_get_le16(&g2);
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switch (chunk_type) {
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case FLI_256_COLOR:
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case FLI_COLOR:
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/* For some reason, it seems that non-palettized flics do
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* include one of these chunks in their first frame.
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* Why I do not know, it seems rather extraneous. */
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ff_dlog(avctx,
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"Unexpected Palette chunk %d in non-palettized FLC\n",
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chunk_type);
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bytestream2_skip(&g2, chunk_size - 6);
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break;
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case FLI_DELTA:
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case FLI_DTA_LC:
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y_ptr = 0;
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compressed_lines = bytestream2_get_le16(&g2);
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while (compressed_lines > 0) {
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if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk)
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break;
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line_packets = bytestream2_get_le16(&g2);
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if (line_packets < 0) {
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line_packets = -line_packets;
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y_ptr += line_packets * s->frame->linesize[0];
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} else {
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compressed_lines--;
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pixel_ptr = y_ptr;
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CHECK_PIXEL_PTR(0);
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pixel_countdown = s->avctx->width;
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for (i = 0; i < line_packets; i++) {
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/* account for the skip bytes */
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if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk)
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break;
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pixel_skip = bytestream2_get_byte(&g2);
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pixel_ptr += (pixel_skip*3); /* Pixel is 3 bytes wide */
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pixel_countdown -= pixel_skip;
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byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
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if (byte_run < 0) {
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byte_run = -byte_run;
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pixel = bytestream2_get_le24(&g2);
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CHECK_PIXEL_PTR(3 * byte_run);
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for (j = 0; j < byte_run; j++, pixel_countdown -= 1) {
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AV_WL24(&pixels[pixel_ptr], pixel);
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pixel_ptr += 3;
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}
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} else {
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if (bytestream2_tell(&g2) + 2*byte_run > stream_ptr_after_chunk)
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break;
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CHECK_PIXEL_PTR(2 * byte_run);
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for (j = 0; j < byte_run; j++, pixel_countdown--) {
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pixel = bytestream2_get_le24(&g2);
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AV_WL24(&pixels[pixel_ptr], pixel);
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pixel_ptr += 3;
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}
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}
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}
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y_ptr += s->frame->linesize[0];
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}
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}
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break;
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case FLI_LC:
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av_log(avctx, AV_LOG_ERROR, "Unexpected FLI_LC chunk in non-palettized FLC\n");
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bytestream2_skip(&g2, chunk_size - 6);
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break;
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case FLI_BLACK:
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/* set the whole frame to 0x00 which is black for 24 bit mode. */
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memset(pixels, 0x00,
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s->frame->linesize[0] * s->avctx->height);
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break;
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case FLI_BRUN:
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y_ptr = 0;
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for (lines = 0; lines < s->avctx->height; lines++) {
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pixel_ptr = y_ptr;
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/* disregard the line packets; instead, iterate through all
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* pixels on a row */
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bytestream2_skip(&g2, 1);
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pixel_countdown = (s->avctx->width * 3);
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while (pixel_countdown > 0) {
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if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)
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break;
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byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
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if (byte_run > 0) {
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palette_idx1 = bytestream2_get_byte(&g2);
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CHECK_PIXEL_PTR(byte_run);
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for (j = 0; j < byte_run; j++) {
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pixels[pixel_ptr++] = palette_idx1;
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pixel_countdown--;
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if (pixel_countdown < 0)
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av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) (linea%d)\n",
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pixel_countdown, lines);
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}
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} else { /* copy bytes if byte_run < 0 */
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byte_run = -byte_run;
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if (bytestream2_tell(&g2) + byte_run > stream_ptr_after_chunk)
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break;
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CHECK_PIXEL_PTR(byte_run);
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for (j = 0; j < byte_run; j++) {
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palette_idx1 = bytestream2_get_byte(&g2);
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pixels[pixel_ptr++] = palette_idx1;
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pixel_countdown--;
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if (pixel_countdown < 0)
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av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
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pixel_countdown, lines);
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}
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}
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}
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y_ptr += s->frame->linesize[0];
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}
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break;
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case FLI_DTA_BRUN:
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y_ptr = 0;
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for (lines = 0; lines < s->avctx->height; lines++) {
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pixel_ptr = y_ptr;
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/* disregard the line packets; instead, iterate through all
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* pixels on a row */
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bytestream2_skip(&g2, 1);
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pixel_countdown = s->avctx->width; /* Width is in pixels, not bytes */
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while (pixel_countdown > 0) {
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if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)
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break;
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byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
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if (byte_run > 0) {
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pixel = bytestream2_get_le24(&g2);
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CHECK_PIXEL_PTR(3 * byte_run);
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for (j = 0; j < byte_run; j++) {
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AV_WL24(pixels + pixel_ptr, pixel);
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pixel_ptr += 3;
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pixel_countdown--;
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if (pixel_countdown < 0)
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av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
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pixel_countdown);
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}
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} else { /* copy pixels if byte_run < 0 */
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byte_run = -byte_run;
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if (bytestream2_tell(&g2) + 3 * byte_run > stream_ptr_after_chunk)
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break;
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CHECK_PIXEL_PTR(3 * byte_run);
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for (j = 0; j < byte_run; j++) {
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pixel = bytestream2_get_le24(&g2);
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AV_WL24(pixels + pixel_ptr, pixel);
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pixel_ptr += 3;
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pixel_countdown--;
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if (pixel_countdown < 0)
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av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
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pixel_countdown);
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}
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}
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}
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y_ptr += s->frame->linesize[0];
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}
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break;
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case FLI_COPY:
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case FLI_DTA_COPY:
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/* copy the chunk (uncompressed frame) */
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if (chunk_size - 6 > (unsigned int)(FFALIGN(s->avctx->width, 2) * s->avctx->height)*3) {
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av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \
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"bigger than image, skipping chunk\n", chunk_size - 6);
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bytestream2_skip(&g2, chunk_size - 6);
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} else {
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for (y_ptr = 0; y_ptr < s->frame->linesize[0] * s->avctx->height;
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y_ptr += s->frame->linesize[0]) {
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pixel_countdown = s->avctx->width;
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pixel_ptr = 0;
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while (pixel_countdown > 0) {
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pixel = bytestream2_get_le24(&g2);
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AV_WL24(&pixels[y_ptr + pixel_ptr], pixel);
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pixel_ptr += 3;
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pixel_countdown--;
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}
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if (s->avctx->width & 1)
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bytestream2_skip(&g2, 3);
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}
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}
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break;
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case FLI_MINI:
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/* some sort of a thumbnail? disregard this chunk... */
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bytestream2_skip(&g2, chunk_size - 6);
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break;
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default:
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av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);
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break;
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}
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frame_size -= chunk_size;
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num_chunks--;
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}
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/* by the end of the chunk, the stream ptr should equal the frame
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* size (minus 1, possibly); if it doesn't, issue a warning */
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if ((bytestream2_get_bytes_left(&g2) != 0) && (bytestream2_get_bytes_left(&g2) != 1))
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av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
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"and final chunk ptr = %d\n", buf_size, bytestream2_tell(&g2));
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if ((ret = av_frame_ref(data, s->frame)) < 0)
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return ret;
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*got_frame = 1;
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return buf_size;
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}
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static int flic_decode_frame(AVCodecContext *avctx,
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