mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-21 16:55:05 +02:00
![Clément Bœsch](/assets/img/avatar_default.png)
Coccinelle profile used: @@ expression r, ctx, f, loglevel, str, flags; @@ -if ((r = ff_get_buffer(ctx, f, flags)) < 0) { - av_log(ctx, loglevel, str); - return r; -} +if ((r = ff_get_buffer(ctx, f, flags)) < 0) + return r; @@ expression r, ctx, f, loglevel, str; @@ -if ((r = ff_reget_buffer(ctx, f)) < 0) { - av_log(ctx, loglevel, str); - return r; -} +if ((r = ff_reget_buffer(ctx, f)) < 0) + return r; @@ expression r, ctx, f, loglevel, str, flags; @@ -if ((r = ff_thread_get_buffer(ctx, f, flags)) < 0) { - av_log(ctx, loglevel, str); - return r; -} +if ((r = ff_thread_get_buffer(ctx, f, flags)) < 0) + return r; ...along with some manual patches for the remaining ones.
234 lines
7.7 KiB
C
234 lines
7.7 KiB
C
/*
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* CPiA video decoder.
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* Copyright (c) 2010 Hans de Goede <hdegoede@redhat.com>
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*
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* This decoder is based on the LGPL code available at
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* https://v4l4j.googlecode.com/svn/v4l4j/trunk/libvideo/libv4lconvert/cpia1.c
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avcodec.h"
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#include "get_bits.h"
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#include "internal.h"
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#define FRAME_HEADER_SIZE 64
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#define MAGIC_0 0x19 /**< First header byte */
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#define MAGIC_1 0x68 /**< Second header byte */
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#define SUBSAMPLE_420 0
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#define SUBSAMPLE_422 1
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#define YUVORDER_YUYV 0
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#define YUVORDER_UYVY 1
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#define NOT_COMPRESSED 0
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#define COMPRESSED 1
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#define NO_DECIMATION 0
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#define DECIMATION_ENAB 1
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#define EOL 0xfd /**< End Of Line marker */
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#define EOI 0xff /**< End Of Image marker */
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typedef struct {
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AVFrame *frame;
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} CpiaContext;
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static int cpia_decode_frame(AVCodecContext *avctx,
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void *data, int *got_frame, AVPacket* avpkt)
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{
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CpiaContext* const cpia = avctx->priv_data;
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int i,j,ret;
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uint8_t* const header = avpkt->data;
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uint8_t* src;
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int src_size;
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uint16_t linelength;
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uint8_t skip;
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AVFrame *frame = cpia->frame;
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uint8_t *y, *u, *v, *y_end, *u_end, *v_end;
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// Check header
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if ( avpkt->size < FRAME_HEADER_SIZE
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|| header[0] != MAGIC_0 || header[1] != MAGIC_1
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|| (header[17] != SUBSAMPLE_420 && header[17] != SUBSAMPLE_422)
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|| (header[18] != YUVORDER_YUYV && header[18] != YUVORDER_UYVY)
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|| (header[28] != NOT_COMPRESSED && header[28] != COMPRESSED)
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|| (header[29] != NO_DECIMATION && header[29] != DECIMATION_ENAB)
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) {
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av_log(avctx, AV_LOG_ERROR, "Invalid header!\n");
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return AVERROR_INVALIDDATA;
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}
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// currently unsupported properties
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if (header[17] == SUBSAMPLE_422) {
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av_log(avctx, AV_LOG_ERROR, "Unsupported subsample!\n");
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return AVERROR_PATCHWELCOME;
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}
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if (header[18] == YUVORDER_UYVY) {
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av_log(avctx, AV_LOG_ERROR, "Unsupported YUV byte order!\n");
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return AVERROR_PATCHWELCOME;
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}
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if (header[29] == DECIMATION_ENAB) {
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av_log(avctx, AV_LOG_ERROR, "Decimation unsupported!\n");
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return AVERROR_PATCHWELCOME;
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}
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src = header + FRAME_HEADER_SIZE;
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src_size = avpkt->size - FRAME_HEADER_SIZE;
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if (header[28] == NOT_COMPRESSED) {
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frame->pict_type = AV_PICTURE_TYPE_I;
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frame->key_frame = 1;
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} else {
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frame->pict_type = AV_PICTURE_TYPE_P;
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frame->key_frame = 0;
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}
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// Get buffer filled with previous frame
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if ((ret = ff_reget_buffer(avctx, frame)) < 0)
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return ret;
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for ( i = 0;
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i < frame->height;
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i++, src += linelength, src_size -= linelength
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) {
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// Read line length, two byte little endian
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linelength = AV_RL16(src);
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src += 2;
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if (src_size < linelength) {
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av_frame_set_decode_error_flags(frame, FF_DECODE_ERROR_INVALID_BITSTREAM);
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av_log(avctx, AV_LOG_WARNING, "Frame ended enexpectedly!\n");
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break;
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}
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if (src[linelength - 1] != EOL) {
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av_frame_set_decode_error_flags(frame, FF_DECODE_ERROR_INVALID_BITSTREAM);
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av_log(avctx, AV_LOG_WARNING, "Wrong line length %d or line not terminated properly (found 0x%02x)!\n", linelength, src[linelength - 1]);
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break;
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}
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/* Update the data pointers. Y data is on every line.
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* U and V data on every second line
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*/
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y = &frame->data[0][i * frame->linesize[0]];
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u = &frame->data[1][(i >> 1) * frame->linesize[1]];
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v = &frame->data[2][(i >> 1) * frame->linesize[2]];
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y_end = y + frame->linesize[0] - 1;
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u_end = u + frame->linesize[1] - 1;
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v_end = v + frame->linesize[2] - 1;
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if ((i & 1) && header[17] == SUBSAMPLE_420) {
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/* We are on a odd line and 420 subsample is used.
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* On this line only Y values are specified, one per pixel.
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*/
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for (j = 0; j < linelength - 1; j++) {
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if (y > y_end) {
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av_frame_set_decode_error_flags(frame, FF_DECODE_ERROR_INVALID_BITSTREAM);
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av_log(avctx, AV_LOG_WARNING, "Decoded data exceeded linesize!\n");
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break;
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}
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if ((src[j] & 1) && header[28] == COMPRESSED) {
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/* It seems that odd lines are always uncompressed, but
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* we do it according to specification anyways.
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*/
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skip = src[j] >> 1;
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y += skip;
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} else {
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*(y++) = src[j];
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}
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}
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} else if (header[17] == SUBSAMPLE_420) {
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/* We are on an even line and 420 subsample is used.
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* On this line each pair of pixels is described by four bytes.
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*/
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for (j = 0; j < linelength - 4; ) {
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if (y + 1 > y_end || u > u_end || v > v_end) {
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av_frame_set_decode_error_flags(frame, FF_DECODE_ERROR_INVALID_BITSTREAM);
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av_log(avctx, AV_LOG_WARNING, "Decoded data exceeded linesize!\n");
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break;
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}
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if ((src[j] & 1) && header[28] == COMPRESSED) {
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// Skip amount of pixels and move forward one byte
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skip = src[j] >> 1;
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y += skip;
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u += skip >> 1;
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v += skip >> 1;
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j++;
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} else {
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// Set image data as specified and move forward 4 bytes
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*(y++) = src[j];
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*(u++) = src[j+1];
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*(y++) = src[j+2];
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*(v++) = src[j+3];
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j += 4;
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}
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}
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}
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}
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*got_frame = 1;
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if ((ret = av_frame_ref(data, cpia->frame)) < 0)
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return ret;
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return avpkt->size;
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}
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static av_cold int cpia_decode_init(AVCodecContext *avctx)
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{
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CpiaContext *s = avctx->priv_data;
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// output pixel format
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avctx->pix_fmt = AV_PIX_FMT_YUV420P;
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/* The default timebase set by the v4l2 demuxer leads to probing which is buggy.
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* Set some reasonable time_base to skip this.
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*/
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if (avctx->time_base.num == 1 && avctx->time_base.den == 1000000) {
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avctx->time_base.num = 1;
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avctx->time_base.den = 60;
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}
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s->frame = av_frame_alloc();
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if (!s->frame)
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return AVERROR(ENOMEM);
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return 0;
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}
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static av_cold int cpia_decode_end(AVCodecContext *avctx)
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{
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CpiaContext *s = avctx->priv_data;
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av_frame_free(&s->frame);
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return 0;
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}
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AVCodec ff_cpia_decoder = {
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.name = "cpia",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_CPIA,
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.priv_data_size = sizeof(CpiaContext),
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.init = cpia_decode_init,
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.close = cpia_decode_end,
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.decode = cpia_decode_frame,
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.capabilities = CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("CPiA video format"),
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};
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