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Diffstat (limited to 'ffmpeg1/libavformat/spdifenc.c')
-rw-r--r--ffmpeg1/libavformat/spdifenc.c557
1 files changed, 557 insertions, 0 deletions
diff --git a/ffmpeg1/libavformat/spdifenc.c b/ffmpeg1/libavformat/spdifenc.c
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+++ b/ffmpeg1/libavformat/spdifenc.c
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+/*
+ * IEC 61937 muxer
+ * Copyright (c) 2009 Bartlomiej Wolowiec
+ * Copyright (c) 2010 Anssi Hannula
+ * Copyright (c) 2010 Carl Eugen Hoyos
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * IEC-61937 encapsulation of various formats, used by S/PDIF
+ * @author Bartlomiej Wolowiec
+ * @author Anssi Hannula
+ * @author Carl Eugen Hoyos
+ */
+
+/*
+ * Terminology used in specification:
+ * data-burst - IEC61937 frame, contains header and encapsuled frame
+ * burst-preambule - IEC61937 frame header, contains 16-bits words named Pa, Pb, Pc and Pd
+ * burst-payload - encapsuled frame
+ * Pa, Pb - syncword - 0xF872, 0x4E1F
+ * Pc - burst-info, contains data-type (bits 0-6), error flag (bit 7), data-type-dependent info (bits 8-12)
+ * and bitstream number (bits 13-15)
+ * data-type - determines type of encapsuled frames
+ * Pd - length code (number of bits or bytes of encapsuled frame - according to data_type)
+ *
+ * IEC 61937 frames at normal usage start every specific count of bytes,
+ * dependent from data-type (spaces between packets are filled by zeros)
+ */
+
+#include "avformat.h"
+#include "avio_internal.h"
+#include "spdif.h"
+#include "libavcodec/ac3.h"
+#include "libavcodec/dca.h"
+#include "libavcodec/aacadtsdec.h"
+#include "libavutil/opt.h"
+
+typedef struct IEC61937Context {
+ const AVClass *av_class;
+ enum IEC61937DataType data_type;///< burst info - reference to type of payload of the data-burst
+ int length_code; ///< length code in bits or bytes, depending on data type
+ int pkt_offset; ///< data burst repetition period in bytes
+ uint8_t *buffer; ///< allocated buffer, used for swap bytes
+ int buffer_size; ///< size of allocated buffer
+
+ uint8_t *out_buf; ///< pointer to the outgoing data before byte-swapping
+ int out_bytes; ///< amount of outgoing bytes
+
+ int use_preamble; ///< preamble enabled (disabled for exactly pre-padded DTS)
+ int extra_bswap; ///< extra bswap for payload (for LE DTS => standard BE DTS)
+
+ uint8_t *hd_buf; ///< allocated buffer to concatenate hd audio frames
+ int hd_buf_size; ///< size of the hd audio buffer
+ int hd_buf_count; ///< number of frames in the hd audio buffer
+ int hd_buf_filled; ///< amount of bytes in the hd audio buffer
+
+ int dtshd_skip; ///< counter used for skipping DTS-HD frames
+
+ /* AVOptions: */
+ int dtshd_rate;
+ int dtshd_fallback;
+#define SPDIF_FLAG_BIGENDIAN 0x01
+ int spdif_flags;
+
+ /// function, which generates codec dependent header information.
+ /// Sets data_type and pkt_offset, and length_code, out_bytes, out_buf if necessary
+ int (*header_info) (AVFormatContext *s, AVPacket *pkt);
+} IEC61937Context;
+
+static const AVOption options[] = {
+{ "spdif_flags", "IEC 61937 encapsulation flags", offsetof(IEC61937Context, spdif_flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "spdif_flags" },
+{ "be", "output in big-endian format (for use as s16be)", 0, AV_OPT_TYPE_CONST, {.i64 = SPDIF_FLAG_BIGENDIAN}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "spdif_flags" },
+{ "dtshd_rate", "mux complete DTS frames in HD mode at the specified IEC958 rate (in Hz, default 0=disabled)", offsetof(IEC61937Context, dtshd_rate), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 768000, AV_OPT_FLAG_ENCODING_PARAM },
+{ "dtshd_fallback_time", "min secs to strip HD for after an overflow (-1: till the end, default 60)", offsetof(IEC61937Context, dtshd_fallback), AV_OPT_TYPE_INT, {.i64 = 60}, -1, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
+{ NULL },
+};
+
+static const AVClass class = {
+ .class_name = "spdif",
+ .item_name = av_default_item_name,
+ .option = options,
+ .version = LIBAVUTIL_VERSION_INT,
+};
+
+static int spdif_header_ac3(AVFormatContext *s, AVPacket *pkt)
+{
+ IEC61937Context *ctx = s->priv_data;
+ int bitstream_mode = pkt->data[5] & 0x7;
+
+ ctx->data_type = IEC61937_AC3 | (bitstream_mode << 8);
+ ctx->pkt_offset = AC3_FRAME_SIZE << 2;
+ return 0;
+}
+
+static int spdif_header_eac3(AVFormatContext *s, AVPacket *pkt)
+{
+ IEC61937Context *ctx = s->priv_data;
+ static const uint8_t eac3_repeat[4] = {6, 3, 2, 1};
+ int repeat = 1;
+
+ if ((pkt->data[4] & 0xc0) != 0xc0) /* fscod */
+ repeat = eac3_repeat[(pkt->data[4] & 0x30) >> 4]; /* numblkscod */
+
+ ctx->hd_buf = av_fast_realloc(ctx->hd_buf, &ctx->hd_buf_size, ctx->hd_buf_filled + pkt->size);
+ if (!ctx->hd_buf)
+ return AVERROR(ENOMEM);
+
+ memcpy(&ctx->hd_buf[ctx->hd_buf_filled], pkt->data, pkt->size);
+
+ ctx->hd_buf_filled += pkt->size;
+ if (++ctx->hd_buf_count < repeat){
+ ctx->pkt_offset = 0;
+ return 0;
+ }
+ ctx->data_type = IEC61937_EAC3;
+ ctx->pkt_offset = 24576;
+ ctx->out_buf = ctx->hd_buf;
+ ctx->out_bytes = ctx->hd_buf_filled;
+ ctx->length_code = ctx->hd_buf_filled;
+
+ ctx->hd_buf_count = 0;
+ ctx->hd_buf_filled = 0;
+ return 0;
+}
+
+/*
+ * DTS type IV (DTS-HD) can be transmitted with various frame repetition
+ * periods; longer repetition periods allow for longer packets and therefore
+ * higher bitrate. Longer repetition periods mean that the constant bitrate of
+ * the outputted IEC 61937 stream is higher.
+ * The repetition period is measured in IEC 60958 frames (4 bytes).
+ */
+static int spdif_dts4_subtype(int period)
+{
+ switch (period) {
+ case 512: return 0x0;
+ case 1024: return 0x1;
+ case 2048: return 0x2;
+ case 4096: return 0x3;
+ case 8192: return 0x4;
+ case 16384: return 0x5;
+ }
+ return -1;
+}
+
+static int spdif_header_dts4(AVFormatContext *s, AVPacket *pkt, int core_size,
+ int sample_rate, int blocks)
+{
+ IEC61937Context *ctx = s->priv_data;
+ static const char dtshd_start_code[10] = { 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfe, 0xfe };
+ int pkt_size = pkt->size;
+ int period;
+ int subtype;
+
+ if (!core_size) {
+ av_log(s, AV_LOG_ERROR, "HD mode not supported for this format\n");
+ return AVERROR(EINVAL);
+ }
+
+ if (!sample_rate) {
+ av_log(s, AV_LOG_ERROR, "Unknown DTS sample rate for HD\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ period = ctx->dtshd_rate * (blocks << 5) / sample_rate;
+ subtype = spdif_dts4_subtype(period);
+
+ if (subtype < 0) {
+ av_log(s, AV_LOG_ERROR, "Specified HD rate of %d Hz would require an "
+ "impossible repetition period of %d for the current DTS stream"
+ " (blocks = %d, sample rate = %d)\n", ctx->dtshd_rate, period,
+ blocks << 5, sample_rate);
+ return AVERROR(EINVAL);
+ }
+
+ /* set pkt_offset and DTS IV subtype according to the requested output
+ * rate */
+ ctx->pkt_offset = period * 4;
+ ctx->data_type = IEC61937_DTSHD | subtype << 8;
+
+ /* If the bitrate is too high for transmitting at the selected
+ * repetition period setting, strip DTS-HD until a good amount
+ * of consecutive non-overflowing HD frames have been observed.
+ * This generally only happens if the caller is cramming a Master
+ * Audio stream into 192kHz IEC 60958 (which may or may not fit). */
+ if (sizeof(dtshd_start_code) + 2 + pkt_size
+ > ctx->pkt_offset - BURST_HEADER_SIZE && core_size) {
+ if (!ctx->dtshd_skip)
+ av_log(s, AV_LOG_WARNING, "DTS-HD bitrate too high, "
+ "temporarily sending core only\n");
+ if (ctx->dtshd_fallback > 0)
+ ctx->dtshd_skip = sample_rate * ctx->dtshd_fallback / (blocks << 5);
+ else
+ /* skip permanently (dtshd_fallback == -1) or just once
+ * (dtshd_fallback == 0) */
+ ctx->dtshd_skip = 1;
+ }
+ if (ctx->dtshd_skip && core_size) {
+ pkt_size = core_size;
+ if (ctx->dtshd_fallback >= 0)
+ --ctx->dtshd_skip;
+ }
+
+ ctx->out_bytes = sizeof(dtshd_start_code) + 2 + pkt_size;
+
+ /* Align so that (length_code & 0xf) == 0x8. This is reportedly needed
+ * with some receivers, but the exact requirement is unconfirmed. */
+ ctx->length_code = FFALIGN(ctx->out_bytes + 0x8, 0x10) - 0x8;
+
+ av_fast_malloc(&ctx->hd_buf, &ctx->hd_buf_size, ctx->out_bytes);
+ if (!ctx->hd_buf)
+ return AVERROR(ENOMEM);
+
+ ctx->out_buf = ctx->hd_buf;
+
+ memcpy(ctx->hd_buf, dtshd_start_code, sizeof(dtshd_start_code));
+ AV_WB16(ctx->hd_buf + sizeof(dtshd_start_code), pkt_size);
+ memcpy(ctx->hd_buf + sizeof(dtshd_start_code) + 2, pkt->data, pkt_size);
+
+ return 0;
+}
+
+static int spdif_header_dts(AVFormatContext *s, AVPacket *pkt)
+{
+ IEC61937Context *ctx = s->priv_data;
+ uint32_t syncword_dts = AV_RB32(pkt->data);
+ int blocks;
+ int sample_rate = 0;
+ int core_size = 0;
+
+ if (pkt->size < 9)
+ return AVERROR_INVALIDDATA;
+
+ switch (syncword_dts) {
+ case DCA_MARKER_RAW_BE:
+ blocks = (AV_RB16(pkt->data + 4) >> 2) & 0x7f;
+ core_size = ((AV_RB24(pkt->data + 5) >> 4) & 0x3fff) + 1;
+ sample_rate = avpriv_dca_sample_rates[(pkt->data[8] >> 2) & 0x0f];
+ break;
+ case DCA_MARKER_RAW_LE:
+ blocks = (AV_RL16(pkt->data + 4) >> 2) & 0x7f;
+ ctx->extra_bswap = 1;
+ break;
+ case DCA_MARKER_14B_BE:
+ blocks =
+ (((pkt->data[5] & 0x07) << 4) | ((pkt->data[6] & 0x3f) >> 2));
+ break;
+ case DCA_MARKER_14B_LE:
+ blocks =
+ (((pkt->data[4] & 0x07) << 4) | ((pkt->data[7] & 0x3f) >> 2));
+ ctx->extra_bswap = 1;
+ break;
+ case DCA_HD_MARKER:
+ /* We only handle HD frames that are paired with core. However,
+ sometimes DTS-HD streams with core have a stray HD frame without
+ core in the beginning of the stream. */
+ av_log(s, AV_LOG_ERROR, "stray DTS-HD frame\n");
+ return AVERROR_INVALIDDATA;
+ default:
+ av_log(s, AV_LOG_ERROR, "bad DTS syncword 0x%x\n", syncword_dts);
+ return AVERROR_INVALIDDATA;
+ }
+ blocks++;
+
+ if (ctx->dtshd_rate)
+ /* DTS type IV output requested */
+ return spdif_header_dts4(s, pkt, core_size, sample_rate, blocks);
+
+ switch (blocks) {
+ case 512 >> 5: ctx->data_type = IEC61937_DTS1; break;
+ case 1024 >> 5: ctx->data_type = IEC61937_DTS2; break;
+ case 2048 >> 5: ctx->data_type = IEC61937_DTS3; break;
+ default:
+ av_log(s, AV_LOG_ERROR, "%i samples in DTS frame not supported\n",
+ blocks << 5);
+ return AVERROR(ENOSYS);
+ }
+
+ /* discard extraneous data by default */
+ if (core_size && core_size < pkt->size) {
+ ctx->out_bytes = core_size;
+ ctx->length_code = core_size << 3;
+ }
+
+ ctx->pkt_offset = blocks << 7;
+
+ if (ctx->out_bytes == ctx->pkt_offset) {
+ /* The DTS stream fits exactly into the output stream, so skip the
+ * preamble as it would not fit in there. This is the case for dts
+ * discs and dts-in-wav. */
+ ctx->use_preamble = 0;
+ } else if (ctx->out_bytes > ctx->pkt_offset - BURST_HEADER_SIZE) {
+ avpriv_request_sample(s, "Unrecognized large DTS frame");
+ /* This will fail with a "bitrate too high" in the caller */
+ }
+
+ return 0;
+}
+
+static const enum IEC61937DataType mpeg_data_type[2][3] = {
+ // LAYER1 LAYER2 LAYER3
+ { IEC61937_MPEG2_LAYER1_LSF, IEC61937_MPEG2_LAYER2_LSF, IEC61937_MPEG2_LAYER3_LSF },//MPEG2 LSF
+ { IEC61937_MPEG1_LAYER1, IEC61937_MPEG1_LAYER23, IEC61937_MPEG1_LAYER23 }, //MPEG1
+};
+
+static int spdif_header_mpeg(AVFormatContext *s, AVPacket *pkt)
+{
+ IEC61937Context *ctx = s->priv_data;
+ int version = (pkt->data[1] >> 3) & 3;
+ int layer = 3 - ((pkt->data[1] >> 1) & 3);
+ int extension = pkt->data[2] & 1;
+
+ if (layer == 3 || version == 1) {
+ av_log(s, AV_LOG_ERROR, "Wrong MPEG file format\n");
+ return AVERROR_INVALIDDATA;
+ }
+ av_log(s, AV_LOG_DEBUG, "version: %i layer: %i extension: %i\n", version, layer, extension);
+ if (version == 2 && extension) {
+ ctx->data_type = IEC61937_MPEG2_EXT;
+ ctx->pkt_offset = 4608;
+ } else {
+ ctx->data_type = mpeg_data_type [version & 1][layer];
+ ctx->pkt_offset = spdif_mpeg_pkt_offset[version & 1][layer];
+ }
+ // TODO Data type dependent info (normal/karaoke, dynamic range control)
+ return 0;
+}
+
+static int spdif_header_aac(AVFormatContext *s, AVPacket *pkt)
+{
+ IEC61937Context *ctx = s->priv_data;
+ AACADTSHeaderInfo hdr;
+ GetBitContext gbc;
+ int ret;
+
+ init_get_bits(&gbc, pkt->data, AAC_ADTS_HEADER_SIZE * 8);
+ ret = avpriv_aac_parse_header(&gbc, &hdr);
+ if (ret < 0) {
+ av_log(s, AV_LOG_ERROR, "Wrong AAC file format\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ ctx->pkt_offset = hdr.samples << 2;
+ switch (hdr.num_aac_frames) {
+ case 1:
+ ctx->data_type = IEC61937_MPEG2_AAC;
+ break;
+ case 2:
+ ctx->data_type = IEC61937_MPEG2_AAC_LSF_2048;
+ break;
+ case 4:
+ ctx->data_type = IEC61937_MPEG2_AAC_LSF_4096;
+ break;
+ default:
+ av_log(s, AV_LOG_ERROR, "%i samples in AAC frame not supported\n",
+ hdr.samples);
+ return AVERROR(EINVAL);
+ }
+ //TODO Data type dependent info (LC profile/SBR)
+ return 0;
+}
+
+
+/*
+ * It seems Dolby TrueHD frames have to be encapsulated in MAT frames before
+ * they can be encapsulated in IEC 61937.
+ * Here we encapsulate 24 TrueHD frames in a single MAT frame, padding them
+ * to achieve constant rate.
+ * The actual format of a MAT frame is unknown, but the below seems to work.
+ * However, it seems it is not actually necessary for the 24 TrueHD frames to
+ * be in an exact alignment with the MAT frame.
+ */
+#define MAT_FRAME_SIZE 61424
+#define TRUEHD_FRAME_OFFSET 2560
+#define MAT_MIDDLE_CODE_OFFSET -4
+
+static int spdif_header_truehd(AVFormatContext *s, AVPacket *pkt)
+{
+ IEC61937Context *ctx = s->priv_data;
+ int mat_code_length = 0;
+ const char mat_end_code[16] = { 0xC3, 0xC2, 0xC0, 0xC4, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x97, 0x11 };
+
+ if (!ctx->hd_buf_count) {
+ const char mat_start_code[20] = { 0x07, 0x9E, 0x00, 0x03, 0x84, 0x01, 0x01, 0x01, 0x80, 0x00, 0x56, 0xA5, 0x3B, 0xF4, 0x81, 0x83, 0x49, 0x80, 0x77, 0xE0 };
+ mat_code_length = sizeof(mat_start_code) + BURST_HEADER_SIZE;
+ memcpy(ctx->hd_buf, mat_start_code, sizeof(mat_start_code));
+
+ } else if (ctx->hd_buf_count == 12) {
+ const char mat_middle_code[12] = { 0xC3, 0xC1, 0x42, 0x49, 0x3B, 0xFA, 0x82, 0x83, 0x49, 0x80, 0x77, 0xE0 };
+ mat_code_length = sizeof(mat_middle_code) + MAT_MIDDLE_CODE_OFFSET;
+ memcpy(&ctx->hd_buf[12 * TRUEHD_FRAME_OFFSET - BURST_HEADER_SIZE + MAT_MIDDLE_CODE_OFFSET],
+ mat_middle_code, sizeof(mat_middle_code));
+ }
+
+ if (pkt->size > TRUEHD_FRAME_OFFSET - mat_code_length) {
+ /* if such frames exist, we'd need some more complex logic to
+ * distribute the TrueHD frames in the MAT frame */
+ avpriv_request_sample(s, "Too large TrueHD frame of %d bytes",
+ pkt->size);
+ return AVERROR_PATCHWELCOME;
+ }
+
+ memcpy(&ctx->hd_buf[ctx->hd_buf_count * TRUEHD_FRAME_OFFSET - BURST_HEADER_SIZE + mat_code_length],
+ pkt->data, pkt->size);
+ memset(&ctx->hd_buf[ctx->hd_buf_count * TRUEHD_FRAME_OFFSET - BURST_HEADER_SIZE + mat_code_length + pkt->size],
+ 0, TRUEHD_FRAME_OFFSET - pkt->size - mat_code_length);
+
+ if (++ctx->hd_buf_count < 24){
+ ctx->pkt_offset = 0;
+ return 0;
+ }
+ memcpy(&ctx->hd_buf[MAT_FRAME_SIZE - sizeof(mat_end_code)], mat_end_code, sizeof(mat_end_code));
+ ctx->hd_buf_count = 0;
+
+ ctx->data_type = IEC61937_TRUEHD;
+ ctx->pkt_offset = 61440;
+ ctx->out_buf = ctx->hd_buf;
+ ctx->out_bytes = MAT_FRAME_SIZE;
+ ctx->length_code = MAT_FRAME_SIZE;
+ return 0;
+}
+
+static int spdif_write_header(AVFormatContext *s)
+{
+ IEC61937Context *ctx = s->priv_data;
+
+ switch (s->streams[0]->codec->codec_id) {
+ case AV_CODEC_ID_AC3:
+ ctx->header_info = spdif_header_ac3;
+ break;
+ case AV_CODEC_ID_EAC3:
+ ctx->header_info = spdif_header_eac3;
+ break;
+ case AV_CODEC_ID_MP1:
+ case AV_CODEC_ID_MP2:
+ case AV_CODEC_ID_MP3:
+ ctx->header_info = spdif_header_mpeg;
+ break;
+ case AV_CODEC_ID_DTS:
+ ctx->header_info = spdif_header_dts;
+ break;
+ case AV_CODEC_ID_AAC:
+ ctx->header_info = spdif_header_aac;
+ break;
+ case AV_CODEC_ID_TRUEHD:
+ ctx->header_info = spdif_header_truehd;
+ ctx->hd_buf = av_malloc(MAT_FRAME_SIZE);
+ if (!ctx->hd_buf)
+ return AVERROR(ENOMEM);
+ break;
+ default:
+ av_log(s, AV_LOG_ERROR, "codec not supported\n");
+ return AVERROR_PATCHWELCOME;
+ }
+ return 0;
+}
+
+static int spdif_write_trailer(AVFormatContext *s)
+{
+ IEC61937Context *ctx = s->priv_data;
+ av_freep(&ctx->buffer);
+ av_freep(&ctx->hd_buf);
+ return 0;
+}
+
+static av_always_inline void spdif_put_16(IEC61937Context *ctx,
+ AVIOContext *pb, unsigned int val)
+{
+ if (ctx->spdif_flags & SPDIF_FLAG_BIGENDIAN)
+ avio_wb16(pb, val);
+ else
+ avio_wl16(pb, val);
+}
+
+static int spdif_write_packet(struct AVFormatContext *s, AVPacket *pkt)
+{
+ IEC61937Context *ctx = s->priv_data;
+ int ret, padding;
+
+ ctx->out_buf = pkt->data;
+ ctx->out_bytes = pkt->size;
+ ctx->length_code = FFALIGN(pkt->size, 2) << 3;
+ ctx->use_preamble = 1;
+ ctx->extra_bswap = 0;
+
+ ret = ctx->header_info(s, pkt);
+ if (ret < 0)
+ return ret;
+ if (!ctx->pkt_offset)
+ return 0;
+
+ padding = (ctx->pkt_offset - ctx->use_preamble * BURST_HEADER_SIZE - ctx->out_bytes) & ~1;
+ if (padding < 0) {
+ av_log(s, AV_LOG_ERROR, "bitrate is too high\n");
+ return AVERROR(EINVAL);
+ }
+
+ if (ctx->use_preamble) {
+ spdif_put_16(ctx, s->pb, SYNCWORD1); //Pa
+ spdif_put_16(ctx, s->pb, SYNCWORD2); //Pb
+ spdif_put_16(ctx, s->pb, ctx->data_type); //Pc
+ spdif_put_16(ctx, s->pb, ctx->length_code);//Pd
+ }
+
+ if (ctx->extra_bswap ^ (ctx->spdif_flags & SPDIF_FLAG_BIGENDIAN)) {
+ avio_write(s->pb, ctx->out_buf, ctx->out_bytes & ~1);
+ } else {
+ av_fast_malloc(&ctx->buffer, &ctx->buffer_size, ctx->out_bytes + FF_INPUT_BUFFER_PADDING_SIZE);
+ if (!ctx->buffer)
+ return AVERROR(ENOMEM);
+ ff_spdif_bswap_buf16((uint16_t *)ctx->buffer, (uint16_t *)ctx->out_buf, ctx->out_bytes >> 1);
+ avio_write(s->pb, ctx->buffer, ctx->out_bytes & ~1);
+ }
+
+ /* a final lone byte has to be MSB aligned */
+ if (ctx->out_bytes & 1)
+ spdif_put_16(ctx, s->pb, ctx->out_buf[ctx->out_bytes - 1] << 8);
+
+ ffio_fill(s->pb, 0, padding);
+
+ av_log(s, AV_LOG_DEBUG, "type=%x len=%i pkt_offset=%i\n",
+ ctx->data_type, ctx->out_bytes, ctx->pkt_offset);
+
+ avio_flush(s->pb);
+ return 0;
+}
+
+AVOutputFormat ff_spdif_muxer = {
+ .name = "spdif",
+ .long_name = NULL_IF_CONFIG_SMALL("IEC 61937 (used on S/PDIF - IEC958)"),
+ .extensions = "spdif",
+ .priv_data_size = sizeof(IEC61937Context),
+ .audio_codec = AV_CODEC_ID_AC3,
+ .video_codec = AV_CODEC_ID_NONE,
+ .write_header = spdif_write_header,
+ .write_packet = spdif_write_packet,
+ .write_trailer = spdif_write_trailer,
+ .flags = AVFMT_NOTIMESTAMPS,
+ .priv_class = &class,
+};
generated by cgit v1.2.3 (git 2.39.1) at 2025-12-06 20:47:45 +0000