393 lines
14 KiB
C
393 lines
14 KiB
C
/*
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* Raw Video Decoder
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* Copyright (c) 2001 Fabrice Bellard
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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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/**
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* @file
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* Raw Video Decoder
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*/
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#include "avcodec.h"
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#include "bswapdsp.h"
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#include "get_bits.h"
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#include "internal.h"
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#include "raw.h"
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#include "libavutil/avassert.h"
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#include "libavutil/buffer.h"
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#include "libavutil/common.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/opt.h"
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typedef struct RawVideoContext {
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AVClass *av_class;
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AVBufferRef *palette;
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int frame_size; /* size of the frame in bytes */
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int flip;
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int is_1_2_4_bpp; // 1 bpp raw in mov, and 2 or 4 bpp raw in avi/mov
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int is_yuv2;
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int is_lt_16bpp; // 16bpp pixfmt and bits_per_coded_sample < 16
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int tff;
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BswapDSPContext bbdsp;
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void *bitstream_buf;
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unsigned int bitstream_buf_size;
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} RawVideoContext;
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static const AVOption options[]={
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{"top", "top field first", offsetof(RawVideoContext, tff), AV_OPT_TYPE_BOOL, {.i64 = -1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM|AV_OPT_FLAG_VIDEO_PARAM},
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{NULL}
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};
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static const AVClass rawdec_class = {
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.class_name = "rawdec",
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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static av_cold int raw_init_decoder(AVCodecContext *avctx)
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{
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RawVideoContext *context = avctx->priv_data;
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const AVPixFmtDescriptor *desc;
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ff_bswapdsp_init(&context->bbdsp);
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if ( avctx->codec_tag == MKTAG('r','a','w',' ')
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|| avctx->codec_tag == MKTAG('N','O','1','6'))
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avctx->pix_fmt = avpriv_find_pix_fmt(avpriv_pix_fmt_bps_mov,
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avctx->bits_per_coded_sample);
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else if (avctx->codec_tag == MKTAG('W', 'R', 'A', 'W'))
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avctx->pix_fmt = avpriv_find_pix_fmt(avpriv_pix_fmt_bps_avi,
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avctx->bits_per_coded_sample);
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else if (avctx->codec_tag && (avctx->codec_tag & 0xFFFFFF) != MKTAG('B','I','T', 0))
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avctx->pix_fmt = avpriv_find_pix_fmt(ff_raw_pix_fmt_tags, avctx->codec_tag);
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else if (avctx->pix_fmt == AV_PIX_FMT_NONE && avctx->bits_per_coded_sample)
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avctx->pix_fmt = avpriv_find_pix_fmt(avpriv_pix_fmt_bps_avi,
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avctx->bits_per_coded_sample);
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desc = av_pix_fmt_desc_get(avctx->pix_fmt);
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if (!desc) {
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av_log(avctx, AV_LOG_ERROR, "Invalid pixel format.\n");
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return AVERROR(EINVAL);
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}
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if (desc->flags & (AV_PIX_FMT_FLAG_PAL | AV_PIX_FMT_FLAG_PSEUDOPAL)) {
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context->palette = av_buffer_alloc(AVPALETTE_SIZE);
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if (!context->palette)
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return AVERROR(ENOMEM);
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if (desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL)
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avpriv_set_systematic_pal2((uint32_t*)context->palette->data, avctx->pix_fmt);
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else {
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memset(context->palette->data, 0, AVPALETTE_SIZE);
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if (avctx->bits_per_coded_sample == 1)
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memset(context->palette->data, 0xff, 4);
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}
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}
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if ((avctx->extradata_size >= 9 &&
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!memcmp(avctx->extradata + avctx->extradata_size - 9, "BottomUp", 9)) ||
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avctx->codec_tag == MKTAG('c','y','u','v') ||
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avctx->codec_tag == MKTAG(3, 0, 0, 0) ||
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avctx->codec_tag == MKTAG('W','R','A','W'))
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context->flip = 1;
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if (avctx->codec_tag == AV_RL32("yuv2") &&
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avctx->pix_fmt == AV_PIX_FMT_YUYV422)
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context->is_yuv2 = 1;
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return 0;
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}
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static void flip(AVCodecContext *avctx, AVFrame *frame)
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{
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frame->data[0] += frame->linesize[0] * (avctx->height - 1);
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frame->linesize[0] *= -1;
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}
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/*
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* Scale sample to 16-bit resolution
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*/
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#define SCALE16(x, bits) (((x) << (16 - (bits))) | ((x) >> (2 * (bits) - 16)))
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/**
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* Scale buffer to 16 bits per coded sample resolution
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*/
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#define MKSCALE16(name, r16, w16) \
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static void name(AVCodecContext *avctx, uint8_t * dst, const uint8_t *buf, int buf_size, int packed) \
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{ \
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int i; \
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if (!packed) { \
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for (i = 0; i + 1 < buf_size; i += 2) \
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w16(dst + i, SCALE16(r16(buf + i), avctx->bits_per_coded_sample)); \
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} else { \
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GetBitContext gb; \
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init_get_bits(&gb, buf, buf_size * 8); \
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for (i = 0; i < avctx->width * avctx->height; i++) { \
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int sample = get_bits(&gb, avctx->bits_per_coded_sample); \
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w16(dst + i*2, SCALE16(sample, avctx->bits_per_coded_sample)); \
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} \
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} \
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}
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MKSCALE16(scale16be, AV_RB16, AV_WB16)
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MKSCALE16(scale16le, AV_RL16, AV_WL16)
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static int raw_decode(AVCodecContext *avctx, void *data, int *got_frame,
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AVPacket *avpkt)
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{
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(avctx->pix_fmt);
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RawVideoContext *context = avctx->priv_data;
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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int linesize_align = 4;
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int res, len;
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int need_copy;
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AVFrame *frame = data;
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if ((avctx->bits_per_coded_sample == 4 || avctx->bits_per_coded_sample == 2
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|| avctx->bits_per_coded_sample == 1) &&
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avctx->pix_fmt == AV_PIX_FMT_PAL8 &&
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(!avctx->codec_tag || avctx->codec_tag == MKTAG('r','a','w',' '))) {
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context->is_1_2_4_bpp = 1;
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context->frame_size = av_image_get_buffer_size(avctx->pix_fmt,
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FFALIGN(avctx->width, 32),
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avctx->height, 1);
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} else {
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context->is_lt_16bpp = av_get_bits_per_pixel(desc) == 16 && avctx->bits_per_coded_sample && avctx->bits_per_coded_sample < 16;
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context->frame_size = av_image_get_buffer_size(avctx->pix_fmt, avctx->width,
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avctx->height, 1);
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}
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if (context->frame_size < 0)
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return context->frame_size;
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need_copy = !avpkt->buf || context->is_1_2_4_bpp || context->is_yuv2 || context->is_lt_16bpp;
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frame->pict_type = AV_PICTURE_TYPE_I;
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frame->key_frame = 1;
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res = ff_decode_frame_props(avctx, frame);
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if (res < 0)
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return res;
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av_frame_set_pkt_pos (frame, avctx->internal->pkt->pos);
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av_frame_set_pkt_duration(frame, avctx->internal->pkt->duration);
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if (context->tff >= 0) {
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frame->interlaced_frame = 1;
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frame->top_field_first = context->tff;
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}
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if ((res = av_image_check_size(avctx->width, avctx->height, 0, avctx)) < 0)
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return res;
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if (need_copy)
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frame->buf[0] = av_buffer_alloc(FFMAX(context->frame_size, buf_size));
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else
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frame->buf[0] = av_buffer_ref(avpkt->buf);
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if (!frame->buf[0])
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return AVERROR(ENOMEM);
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// 1 bpp raw in mov, and 2 or 4 bpp raw in avi/mov
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if (context->is_1_2_4_bpp) {
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int i;
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uint8_t *dst = frame->buf[0]->data;
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buf_size = context->frame_size - AVPALETTE_SIZE;
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if (avctx->bits_per_coded_sample == 4) {
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for (i = 0; 2 * i + 1 < buf_size && i<avpkt->size; i++) {
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dst[2 * i + 0] = buf[i] >> 4;
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dst[2 * i + 1] = buf[i] & 15;
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}
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linesize_align = 8;
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} else if (avctx->bits_per_coded_sample == 2) {
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for (i = 0; 4 * i + 3 < buf_size && i<avpkt->size; i++) {
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dst[4 * i + 0] = buf[i] >> 6;
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dst[4 * i + 1] = buf[i] >> 4 & 3;
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dst[4 * i + 2] = buf[i] >> 2 & 3;
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dst[4 * i + 3] = buf[i] & 3;
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}
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linesize_align = 16;
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} else {
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av_assert0(avctx->bits_per_coded_sample == 1);
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for (i = 0; 8 * i + 7 < buf_size && i<avpkt->size; i++) {
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dst[8 * i + 0] = buf[i] >> 7 & 1;
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dst[8 * i + 1] = buf[i] >> 6 & 1;
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dst[8 * i + 2] = buf[i] >> 5 & 1;
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dst[8 * i + 3] = buf[i] >> 4 & 1;
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dst[8 * i + 4] = buf[i] >> 3 & 1;
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dst[8 * i + 5] = buf[i] >> 2 & 1;
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dst[8 * i + 6] = buf[i] >> 1 & 1;
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dst[8 * i + 7] = buf[i] & 1;
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}
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linesize_align = 32;
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}
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buf = dst;
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} else if (context->is_lt_16bpp) {
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uint8_t *dst = frame->buf[0]->data;
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int packed = (avctx->codec_tag & 0xFFFFFF) == MKTAG('B','I','T', 0);
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int swap = avctx->codec_tag >> 24;
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if (packed && swap) {
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av_fast_padded_malloc(&context->bitstream_buf, &context->bitstream_buf_size, buf_size);
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if (!context->bitstream_buf)
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return AVERROR(ENOMEM);
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if (swap == 16)
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context->bbdsp.bswap16_buf(context->bitstream_buf, (const uint16_t*)buf, buf_size / 2);
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else if (swap == 32)
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context->bbdsp.bswap_buf(context->bitstream_buf, (const uint32_t*)buf, buf_size / 4);
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else
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return AVERROR_INVALIDDATA;
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buf = context->bitstream_buf;
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}
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if (desc->flags & AV_PIX_FMT_FLAG_BE)
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scale16be(avctx, dst, buf, buf_size, packed);
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else
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scale16le(avctx, dst, buf, buf_size, packed);
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buf = dst;
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} else if (need_copy) {
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memcpy(frame->buf[0]->data, buf, buf_size);
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buf = frame->buf[0]->data;
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}
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if (avctx->codec_tag == MKTAG('A', 'V', '1', 'x') ||
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avctx->codec_tag == MKTAG('A', 'V', 'u', 'p'))
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buf += buf_size - context->frame_size;
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len = context->frame_size - (avctx->pix_fmt==AV_PIX_FMT_PAL8 ? AVPALETTE_SIZE : 0);
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if (buf_size < len && ((avctx->codec_tag & 0xFFFFFF) != MKTAG('B','I','T', 0) || !need_copy)) {
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av_log(avctx, AV_LOG_ERROR, "Invalid buffer size, packet size %d < expected frame_size %d\n", buf_size, len);
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av_buffer_unref(&frame->buf[0]);
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return AVERROR(EINVAL);
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}
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if ((res = av_image_fill_arrays(frame->data, frame->linesize,
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buf, avctx->pix_fmt,
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avctx->width, avctx->height, 1)) < 0) {
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av_buffer_unref(&frame->buf[0]);
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return res;
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}
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if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
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const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE,
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NULL);
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if (pal) {
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av_buffer_unref(&context->palette);
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context->palette = av_buffer_alloc(AVPALETTE_SIZE);
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if (!context->palette) {
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av_buffer_unref(&frame->buf[0]);
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return AVERROR(ENOMEM);
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}
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memcpy(context->palette->data, pal, AVPALETTE_SIZE);
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frame->palette_has_changed = 1;
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}
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}
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if ((avctx->pix_fmt==AV_PIX_FMT_BGR24 ||
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avctx->pix_fmt==AV_PIX_FMT_GRAY8 ||
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avctx->pix_fmt==AV_PIX_FMT_RGB555LE ||
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avctx->pix_fmt==AV_PIX_FMT_RGB555BE ||
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avctx->pix_fmt==AV_PIX_FMT_RGB565LE ||
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avctx->pix_fmt==AV_PIX_FMT_MONOWHITE ||
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avctx->pix_fmt==AV_PIX_FMT_PAL8) &&
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FFALIGN(frame->linesize[0], linesize_align) * avctx->height <= buf_size)
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frame->linesize[0] = FFALIGN(frame->linesize[0], linesize_align);
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if (avctx->pix_fmt == AV_PIX_FMT_NV12 && avctx->codec_tag == MKTAG('N', 'V', '1', '2') &&
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FFALIGN(frame->linesize[0], linesize_align) * avctx->height +
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FFALIGN(frame->linesize[1], linesize_align) * ((avctx->height + 1) / 2) <= buf_size) {
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int la0 = FFALIGN(frame->linesize[0], linesize_align);
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frame->data[1] += (la0 - frame->linesize[0]) * avctx->height;
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frame->linesize[0] = la0;
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frame->linesize[1] = FFALIGN(frame->linesize[1], linesize_align);
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}
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if ((avctx->pix_fmt == AV_PIX_FMT_PAL8 && buf_size < context->frame_size) ||
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(desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL)) {
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frame->buf[1] = av_buffer_ref(context->palette);
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if (!frame->buf[1]) {
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av_buffer_unref(&frame->buf[0]);
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return AVERROR(ENOMEM);
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}
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frame->data[1] = frame->buf[1]->data;
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}
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if (avctx->pix_fmt == AV_PIX_FMT_BGR24 &&
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((frame->linesize[0] + 3) & ~3) * avctx->height <= buf_size)
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frame->linesize[0] = (frame->linesize[0] + 3) & ~3;
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if (context->flip)
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flip(avctx, frame);
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if (avctx->codec_tag == MKTAG('Y', 'V', '1', '2') ||
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avctx->codec_tag == MKTAG('Y', 'V', '1', '6') ||
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avctx->codec_tag == MKTAG('Y', 'V', '2', '4') ||
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avctx->codec_tag == MKTAG('Y', 'V', 'U', '9'))
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FFSWAP(uint8_t *, frame->data[1], frame->data[2]);
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if (avctx->codec_tag == AV_RL32("I420") && (avctx->width+1)*(avctx->height+1) * 3/2 == buf_size) {
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frame->data[1] = frame->data[1] + (avctx->width+1)*(avctx->height+1) -avctx->width*avctx->height;
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frame->data[2] = frame->data[2] + ((avctx->width+1)*(avctx->height+1) -avctx->width*avctx->height)*5/4;
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}
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if (avctx->codec_tag == AV_RL32("yuv2") &&
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avctx->pix_fmt == AV_PIX_FMT_YUYV422) {
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int x, y;
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uint8_t *line = frame->data[0];
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for (y = 0; y < avctx->height; y++) {
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for (x = 0; x < avctx->width; x++)
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line[2 * x + 1] ^= 0x80;
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line += frame->linesize[0];
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}
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}
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if (avctx->field_order > AV_FIELD_PROGRESSIVE) { /* we have interlaced material flagged in container */
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frame->interlaced_frame = 1;
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if (avctx->field_order == AV_FIELD_TT || avctx->field_order == AV_FIELD_TB)
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frame->top_field_first = 1;
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}
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*got_frame = 1;
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return buf_size;
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}
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static av_cold int raw_close_decoder(AVCodecContext *avctx)
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{
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RawVideoContext *context = avctx->priv_data;
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av_buffer_unref(&context->palette);
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return 0;
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}
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AVCodec ff_rawvideo_decoder = {
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.name = "rawvideo",
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.long_name = NULL_IF_CONFIG_SMALL("raw video"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_RAWVIDEO,
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.priv_data_size = sizeof(RawVideoContext),
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.init = raw_init_decoder,
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.close = raw_close_decoder,
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.decode = raw_decode,
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.priv_class = &rawdec_class,
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.capabilities = AV_CODEC_CAP_PARAM_CHANGE,
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};
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