mirror of
https://github.com/FFmpeg/FFmpeg.git
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fed0282508
Do this by allocating AVFormatContext together with the data that is currently in AVFormatInternal; or rather: Put AVFormatContext at the beginning of a new structure called FFFormatContext (which encompasses more than just the internal fields and is a proper context in its own right, hence the name) and remove AVFormatInternal altogether. The biggest simplifications occured in avformat_alloc_context(), where one can now simply call avformat_free_context() in case of errors. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
335 lines
13 KiB
C
335 lines
13 KiB
C
/*
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* YUV4MPEG demuxer
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* Copyright (c) 2001, 2002, 2003 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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#include "libavutil/avstring.h"
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#include "libavutil/imgutils.h"
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#include "avformat.h"
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#include "internal.h"
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#include "yuv4mpeg.h"
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/* Header size increased to allow room for optional flags */
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#define MAX_YUV4_HEADER 96
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#define MAX_FRAME_HEADER 80
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static int yuv4_read_header(AVFormatContext *s)
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{
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char header[MAX_YUV4_HEADER + 10]; // Include headroom for
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// the longest option
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char *tokstart, *tokend, *header_end;
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int i;
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AVIOContext *pb = s->pb;
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int width = -1, height = -1, raten = 0,
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rated = 0, aspectn = 0, aspectd = 0;
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enum AVPixelFormat pix_fmt = AV_PIX_FMT_NONE, alt_pix_fmt = AV_PIX_FMT_NONE;
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enum AVChromaLocation chroma_sample_location = AVCHROMA_LOC_UNSPECIFIED;
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enum AVFieldOrder field_order = AV_FIELD_UNKNOWN;
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enum AVColorRange color_range = AVCOL_RANGE_UNSPECIFIED;
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AVStream *st;
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int64_t data_offset;
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for (i = 0; i < MAX_YUV4_HEADER; i++) {
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header[i] = avio_r8(pb);
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if (header[i] == '\n') {
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header[i + 1] = 0x20; // Add a space after last option.
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// Makes parsing "444" vs "444alpha" easier.
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header[i + 2] = 0;
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break;
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}
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}
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if (i == MAX_YUV4_HEADER) {
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av_log(s, AV_LOG_ERROR, "Header too large.\n");
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return AVERROR(EINVAL);
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}
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if (strncmp(header, Y4M_MAGIC, strlen(Y4M_MAGIC))) {
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av_log(s, AV_LOG_ERROR, "Invalid magic number for yuv4mpeg.\n");
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return AVERROR(EINVAL);
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}
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header_end = &header[i + 1]; // Include space
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for (tokstart = &header[strlen(Y4M_MAGIC) + 1];
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tokstart < header_end; tokstart++) {
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if (*tokstart == 0x20)
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continue;
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switch (*tokstart++) {
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case 'W': // Width. Required.
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width = strtol(tokstart, &tokend, 10);
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tokstart = tokend;
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break;
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case 'H': // Height. Required.
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height = strtol(tokstart, &tokend, 10);
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tokstart = tokend;
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break;
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case 'C': // Color space
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{
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static const struct {
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#define MAX_PIX_FMT_LENGTH 8
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char name[MAX_PIX_FMT_LENGTH + 1];
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#undef MAX_PIX_FMT_LENGTH
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enum AVPixelFormat pix_fmt;
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enum AVChromaLocation chroma_loc;
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} pix_fmt_array[] = {
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{ "420jpeg", AV_PIX_FMT_YUV420P, AVCHROMA_LOC_CENTER },
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{ "420mpeg2", AV_PIX_FMT_YUV420P, AVCHROMA_LOC_LEFT },
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{ "420paldv", AV_PIX_FMT_YUV420P, AVCHROMA_LOC_TOPLEFT },
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{ "420p16", AV_PIX_FMT_YUV420P16, AVCHROMA_LOC_UNSPECIFIED },
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{ "422p16", AV_PIX_FMT_YUV422P16, AVCHROMA_LOC_UNSPECIFIED },
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{ "444p16", AV_PIX_FMT_YUV444P16, AVCHROMA_LOC_UNSPECIFIED },
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{ "420p14", AV_PIX_FMT_YUV420P14, AVCHROMA_LOC_UNSPECIFIED },
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{ "422p14", AV_PIX_FMT_YUV422P14, AVCHROMA_LOC_UNSPECIFIED },
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{ "444p14", AV_PIX_FMT_YUV444P14, AVCHROMA_LOC_UNSPECIFIED },
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{ "420p12", AV_PIX_FMT_YUV420P12, AVCHROMA_LOC_UNSPECIFIED },
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{ "422p12", AV_PIX_FMT_YUV422P12, AVCHROMA_LOC_UNSPECIFIED },
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{ "444p12", AV_PIX_FMT_YUV444P12, AVCHROMA_LOC_UNSPECIFIED },
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{ "420p10", AV_PIX_FMT_YUV420P10, AVCHROMA_LOC_UNSPECIFIED },
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{ "422p10", AV_PIX_FMT_YUV422P10, AVCHROMA_LOC_UNSPECIFIED },
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{ "444p10", AV_PIX_FMT_YUV444P10, AVCHROMA_LOC_UNSPECIFIED },
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{ "420p9", AV_PIX_FMT_YUV420P9, AVCHROMA_LOC_UNSPECIFIED },
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{ "422p9", AV_PIX_FMT_YUV422P9, AVCHROMA_LOC_UNSPECIFIED },
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{ "444p9", AV_PIX_FMT_YUV444P9, AVCHROMA_LOC_UNSPECIFIED },
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{ "420", AV_PIX_FMT_YUV420P, AVCHROMA_LOC_CENTER },
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{ "411", AV_PIX_FMT_YUV411P, AVCHROMA_LOC_UNSPECIFIED },
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{ "422", AV_PIX_FMT_YUV422P, AVCHROMA_LOC_UNSPECIFIED },
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{ "444alpha", AV_PIX_FMT_YUVA444P, AVCHROMA_LOC_UNSPECIFIED },
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{ "444", AV_PIX_FMT_YUV444P, AVCHROMA_LOC_UNSPECIFIED },
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{ "mono16", AV_PIX_FMT_GRAY16, AVCHROMA_LOC_UNSPECIFIED },
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{ "mono12", AV_PIX_FMT_GRAY12, AVCHROMA_LOC_UNSPECIFIED },
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{ "mono10", AV_PIX_FMT_GRAY10, AVCHROMA_LOC_UNSPECIFIED },
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{ "mono9", AV_PIX_FMT_GRAY9, AVCHROMA_LOC_UNSPECIFIED },
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{ "mono", AV_PIX_FMT_GRAY8, AVCHROMA_LOC_UNSPECIFIED },
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};
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for (i = 0; i < FF_ARRAY_ELEMS(pix_fmt_array); i++) {
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if (av_strstart(tokstart, pix_fmt_array[i].name, NULL)) {
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pix_fmt = pix_fmt_array[i].pix_fmt;
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if (pix_fmt_array[i].chroma_loc != AVCHROMA_LOC_UNSPECIFIED)
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chroma_sample_location = pix_fmt_array[i].chroma_loc;
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break;
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}
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}
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if (i == FF_ARRAY_ELEMS(pix_fmt_array)) {
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av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains an unknown "
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"pixel format.\n");
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return AVERROR_INVALIDDATA;
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}
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while (tokstart < header_end && *tokstart != 0x20)
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tokstart++;
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break;
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}
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case 'I': // Interlace type
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switch (*tokstart++){
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case '?':
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field_order = AV_FIELD_UNKNOWN;
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break;
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case 'p':
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field_order = AV_FIELD_PROGRESSIVE;
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break;
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case 't':
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field_order = AV_FIELD_TT;
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break;
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case 'b':
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field_order = AV_FIELD_BB;
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break;
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case 'm':
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av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains mixed "
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"interlaced and non-interlaced frames.\n");
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default:
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av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
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return AVERROR(EINVAL);
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}
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break;
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case 'F': // Frame rate
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sscanf(tokstart, "%d:%d", &raten, &rated); // 0:0 if unknown
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while (tokstart < header_end && *tokstart != 0x20)
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tokstart++;
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break;
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case 'A': // Pixel aspect
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sscanf(tokstart, "%d:%d", &aspectn, &aspectd); // 0:0 if unknown
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while (tokstart < header_end && *tokstart != 0x20)
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tokstart++;
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break;
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case 'X': // Vendor extensions
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if (strncmp("YSCSS=", tokstart, 6) == 0) {
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static const struct {
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#define MAX_PIX_FMT_LENGTH 8
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char name[MAX_PIX_FMT_LENGTH + 1];
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#undef MAX_PIX_FMT_LENGTH
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enum AVPixelFormat pix_fmt;
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} pix_fmt_array[] = {
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{ "420JPEG", AV_PIX_FMT_YUV420P },
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{ "420MPEG2", AV_PIX_FMT_YUV420P },
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{ "420PALDV", AV_PIX_FMT_YUV420P },
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{ "420P9", AV_PIX_FMT_YUV420P9 },
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{ "422P9", AV_PIX_FMT_YUV422P9 },
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{ "444P9", AV_PIX_FMT_YUV444P9 },
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{ "420P10", AV_PIX_FMT_YUV420P10 },
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{ "444P10", AV_PIX_FMT_YUV444P10 },
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{ "420P12", AV_PIX_FMT_YUV420P12 },
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{ "422P12", AV_PIX_FMT_YUV422P12 },
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{ "444P12", AV_PIX_FMT_YUV444P12 },
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{ "420P14", AV_PIX_FMT_YUV420P14 },
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{ "422P14", AV_PIX_FMT_YUV422P14 },
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{ "444P14", AV_PIX_FMT_YUV444P14 },
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{ "420P16", AV_PIX_FMT_YUV420P16 },
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{ "422P16", AV_PIX_FMT_YUV422P16 },
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{ "444P16", AV_PIX_FMT_YUV444P16 },
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{ "411", AV_PIX_FMT_YUV411P },
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{ "422", AV_PIX_FMT_YUV422P },
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{ "444", AV_PIX_FMT_YUV444P },
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};
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// Older nonstandard pixel format representation
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tokstart += 6;
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for (size_t i = 0; i < FF_ARRAY_ELEMS(pix_fmt_array); i++)
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if (av_strstart(tokstart, pix_fmt_array[i].name, NULL)) {
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alt_pix_fmt = pix_fmt_array[i].pix_fmt;
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break;
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}
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} else if (strncmp("COLORRANGE=", tokstart, 11) == 0) {
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tokstart += 11;
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if (strncmp("FULL",tokstart, 4) == 0)
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color_range = AVCOL_RANGE_JPEG;
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else if (strncmp("LIMITED", tokstart, 7) == 0)
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color_range = AVCOL_RANGE_MPEG;
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}
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while (tokstart < header_end && *tokstart != 0x20)
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tokstart++;
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break;
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}
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}
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if (width == -1 || height == -1) {
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av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
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return AVERROR_INVALIDDATA;
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}
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if (pix_fmt == AV_PIX_FMT_NONE) {
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if (alt_pix_fmt == AV_PIX_FMT_NONE)
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pix_fmt = AV_PIX_FMT_YUV420P;
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else
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pix_fmt = alt_pix_fmt;
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}
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if (raten <= 0 || rated <= 0) {
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// Frame rate unknown
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raten = 25;
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rated = 1;
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}
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if (aspectn == 0 && aspectd == 0) {
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// Pixel aspect unknown
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aspectd = 1;
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}
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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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st->codecpar->width = width;
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st->codecpar->height = height;
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av_reduce(&raten, &rated, raten, rated, (1UL << 31) - 1);
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avpriv_set_pts_info(st, 64, rated, raten);
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st->avg_frame_rate = av_inv_q(st->time_base);
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st->codecpar->format = pix_fmt;
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st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
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st->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
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st->sample_aspect_ratio = (AVRational){ aspectn, aspectd };
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st->codecpar->chroma_location = chroma_sample_location;
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st->codecpar->color_range = color_range;
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st->codecpar->field_order = field_order;
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s->packet_size = av_image_get_buffer_size(st->codecpar->format, width, height, 1) + Y4M_FRAME_MAGIC_LEN;
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if ((int) s->packet_size < 0)
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return s->packet_size;
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ffformatcontext(s)->data_offset = data_offset = avio_tell(pb);
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st->duration = (avio_size(pb) - data_offset) / s->packet_size;
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return 0;
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}
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static int yuv4_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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int i;
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char header[MAX_FRAME_HEADER+1];
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int ret;
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int64_t off = avio_tell(s->pb);
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for (i = 0; i < MAX_FRAME_HEADER; i++) {
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header[i] = avio_r8(s->pb);
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if (header[i] == '\n') {
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header[i + 1] = 0;
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break;
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}
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}
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if (s->pb->error)
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return s->pb->error;
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else if (s->pb->eof_reached)
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return AVERROR_EOF;
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else if (i == MAX_FRAME_HEADER)
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return AVERROR_INVALIDDATA;
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if (strncmp(header, Y4M_FRAME_MAGIC, strlen(Y4M_FRAME_MAGIC)))
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return AVERROR_INVALIDDATA;
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ret = av_get_packet(s->pb, pkt, s->packet_size - Y4M_FRAME_MAGIC_LEN);
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if (ret < 0)
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return ret;
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else if (ret != s->packet_size - Y4M_FRAME_MAGIC_LEN) {
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return s->pb->eof_reached ? AVERROR_EOF : AVERROR(EIO);
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}
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pkt->stream_index = 0;
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pkt->pts = (off - ffformatcontext(s)->data_offset) / s->packet_size;
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pkt->duration = 1;
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return 0;
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}
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static int yuv4_read_seek(AVFormatContext *s, int stream_index,
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int64_t pts, int flags)
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{
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int64_t pos;
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if (flags & AVSEEK_FLAG_BACKWARD)
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pts = FFMAX(0, pts - 1);
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if (pts < 0)
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return -1;
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pos = pts * s->packet_size;
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if (avio_seek(s->pb, pos + ffformatcontext(s)->data_offset, SEEK_SET) < 0)
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return -1;
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return 0;
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}
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static int yuv4_probe(const AVProbeData *pd)
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{
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/* check file header */
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if (strncmp(pd->buf, Y4M_MAGIC, sizeof(Y4M_MAGIC) - 1) == 0)
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return AVPROBE_SCORE_MAX;
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else
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return 0;
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}
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const AVInputFormat ff_yuv4mpegpipe_demuxer = {
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.name = "yuv4mpegpipe",
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.long_name = NULL_IF_CONFIG_SMALL("YUV4MPEG pipe"),
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.read_probe = yuv4_probe,
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.read_header = yuv4_read_header,
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.read_packet = yuv4_read_packet,
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.read_seek = yuv4_read_seek,
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.extensions = "y4m",
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};
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