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🎥 Command line media player
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#include <string.h>#include <assert.h>
#include <libavformat/avformat.h>#include <libavcodec/avcodec.h>#include <libavutil/opt.h>
#include "audio/aframe.h"#include "audio/format.h"#include "common/av_common.h"#include "common/codecs.h"#include "common/msg.h"#include "demux/packet.h"#include "demux/stheader.h"#include "filters/f_decoder_wrapper.h"#include "filters/filter_internal.h"#include "options/options.h"
#define OUTBUF_SIZE 65536
struct spdifContext { struct mp_log *log; enum AVCodecID codec_id; AVFormatContext *lavf_ctx; int out_buffer_len; uint8_t out_buffer[OUTBUF_SIZE]; bool need_close; bool use_dts_hd; struct mp_aframe *fmt; int sstride; struct mp_aframe_pool *pool;
struct mp_decoder public;};
static int write_packet(void *p, uint8_t *buf, int buf_size){ struct spdifContext *ctx = p;
int buffer_left = OUTBUF_SIZE - ctx->out_buffer_len; if (buf_size > buffer_left) { MP_ERR(ctx, "spdif packet too large.\n"); buf_size = buffer_left; }
memcpy(&ctx->out_buffer[ctx->out_buffer_len], buf, buf_size); ctx->out_buffer_len += buf_size; return buf_size;}
// (called on both filter destruction _and_ if lavf fails to init)static void destroy(struct mp_filter *da){ struct spdifContext *spdif_ctx = da->priv; AVFormatContext *lavf_ctx = spdif_ctx->lavf_ctx;
if (lavf_ctx) { if (spdif_ctx->need_close) av_write_trailer(lavf_ctx); if (lavf_ctx->pb) av_freep(&lavf_ctx->pb->buffer); av_freep(&lavf_ctx->pb); avformat_free_context(lavf_ctx); spdif_ctx->lavf_ctx = NULL; }}
static void determine_codec_params(struct mp_filter *da, AVPacket *pkt, int *out_profile, int *out_rate){ struct spdifContext *spdif_ctx = da->priv; int profile = FF_PROFILE_UNKNOWN; AVCodecContext *ctx = NULL; AVFrame *frame = NULL;
AVCodecParserContext *parser = av_parser_init(spdif_ctx->codec_id); if (parser) { // Don't make it wait for the next frame. parser->flags |= PARSER_FLAG_COMPLETE_FRAMES;
ctx = avcodec_alloc_context3(NULL); if (!ctx) { av_parser_close(parser); goto done; }
uint8_t *d = NULL; int s = 0; av_parser_parse2(parser, ctx, &d, &s, pkt->data, pkt->size, 0, 0, 0); *out_profile = profile = ctx->profile; *out_rate = ctx->sample_rate;
avcodec_free_context(&ctx); av_parser_close(parser); }
if (profile != FF_PROFILE_UNKNOWN || spdif_ctx->codec_id != AV_CODEC_ID_DTS) return;
AVCodec *codec = avcodec_find_decoder(spdif_ctx->codec_id); if (!codec) goto done;
frame = av_frame_alloc(); if (!frame) goto done;
ctx = avcodec_alloc_context3(codec); if (!ctx) goto done;
if (avcodec_open2(ctx, codec, NULL) < 0) goto done;
if (avcodec_send_packet(ctx, pkt) < 0) goto done; if (avcodec_receive_frame(ctx, frame) < 0) goto done;
*out_profile = profile = ctx->profile; *out_rate = ctx->sample_rate;
done: av_frame_free(&frame); avcodec_free_context(&ctx);
if (profile == FF_PROFILE_UNKNOWN) MP_WARN(da, "Failed to parse codec profile.\n");}
static int init_filter(struct mp_filter *da, AVPacket *pkt){ struct spdifContext *spdif_ctx = da->priv;
int profile = FF_PROFILE_UNKNOWN; int c_rate = 0; determine_codec_params(da, pkt, &profile, &c_rate); MP_VERBOSE(da, "In: profile=%d samplerate=%d\n", profile, c_rate);
AVFormatContext *lavf_ctx = avformat_alloc_context(); if (!lavf_ctx) goto fail;
spdif_ctx->lavf_ctx = lavf_ctx;
lavf_ctx->oformat = av_guess_format("spdif", NULL, NULL); if (!lavf_ctx->oformat) goto fail;
void *buffer = av_mallocz(OUTBUF_SIZE); if (!buffer) abort(); lavf_ctx->pb = avio_alloc_context(buffer, OUTBUF_SIZE, 1, spdif_ctx, NULL, write_packet, NULL); if (!lavf_ctx->pb) { av_free(buffer); goto fail; }
// Request minimal buffering (not available on Libav)#if LIBAVFORMAT_VERSION_MICRO >= 100 lavf_ctx->pb->direct = 1;#endif
AVStream *stream = avformat_new_stream(lavf_ctx, 0); if (!stream) goto fail;
stream->codecpar->codec_id = spdif_ctx->codec_id;
AVDictionary *format_opts = NULL;
spdif_ctx->fmt = mp_aframe_create(); talloc_steal(spdif_ctx, spdif_ctx->fmt);
int num_channels = 0; int sample_format = 0; int samplerate = 0; switch (spdif_ctx->codec_id) { case AV_CODEC_ID_AAC: sample_format = AF_FORMAT_S_AAC; samplerate = 48000; num_channels = 2; break; case AV_CODEC_ID_AC3: sample_format = AF_FORMAT_S_AC3; samplerate = c_rate > 0 ? c_rate : 48000; num_channels = 2; break; case AV_CODEC_ID_DTS: { bool is_hd = profile == FF_PROFILE_DTS_HD_HRA || profile == FF_PROFILE_DTS_HD_MA || profile == FF_PROFILE_UNKNOWN;
// Apparently, DTS-HD over SPDIF is specified to be 7.1 (8 channels) // for DTS-HD MA, and stereo (2 channels) for DTS-HD HRA. The bit // streaming rate as well as the signaled channel count are defined // based on this value. int dts_hd_spdif_channel_count = profile == FF_PROFILE_DTS_HD_HRA ? 2 : 8; if (spdif_ctx->use_dts_hd && is_hd) { av_dict_set_int(&format_opts, "dtshd_rate", dts_hd_spdif_channel_count * 96000, 0); sample_format = AF_FORMAT_S_DTSHD; samplerate = 192000; num_channels = dts_hd_spdif_channel_count; } else { sample_format = AF_FORMAT_S_DTS; samplerate = 48000; num_channels = 2; } break; } case AV_CODEC_ID_EAC3: sample_format = AF_FORMAT_S_EAC3; samplerate = 192000; num_channels = 2; break; case AV_CODEC_ID_MP3: sample_format = AF_FORMAT_S_MP3; samplerate = 48000; num_channels = 2; break; case AV_CODEC_ID_TRUEHD: sample_format = AF_FORMAT_S_TRUEHD; samplerate = 192000; num_channels = 8; break; default: abort(); }
struct mp_chmap chmap; mp_chmap_from_channels(&chmap, num_channels); mp_aframe_set_chmap(spdif_ctx->fmt, &chmap); mp_aframe_set_format(spdif_ctx->fmt, sample_format); mp_aframe_set_rate(spdif_ctx->fmt, samplerate);
spdif_ctx->sstride = mp_aframe_get_sstride(spdif_ctx->fmt);
if (avformat_write_header(lavf_ctx, &format_opts) < 0) { MP_FATAL(da, "libavformat spdif initialization failed.\n"); av_dict_free(&format_opts); goto fail; } av_dict_free(&format_opts);
spdif_ctx->need_close = true;
return 0;
fail: destroy(da); mp_filter_internal_mark_failed(da); return -1;}
static void process(struct mp_filter *da){ struct spdifContext *spdif_ctx = da->priv;
if (!mp_pin_can_transfer_data(da->ppins[1], da->ppins[0])) return;
struct mp_frame inframe = mp_pin_out_read(da->ppins[0]); if (inframe.type == MP_FRAME_EOF) { mp_pin_in_write(da->ppins[1], inframe); return; } else if (inframe.type != MP_FRAME_PACKET) { if (inframe.type) { MP_ERR(da, "unknown frame type\n"); mp_filter_internal_mark_failed(da); } return; }
struct demux_packet *mpkt = inframe.data; struct mp_aframe *out = NULL; double pts = mpkt->pts;
AVPacket pkt; mp_set_av_packet(&pkt, mpkt, NULL); pkt.pts = pkt.dts = 0; if (!spdif_ctx->lavf_ctx) { if (init_filter(da, &pkt) < 0) goto done; } spdif_ctx->out_buffer_len = 0; int ret = av_write_frame(spdif_ctx->lavf_ctx, &pkt); avio_flush(spdif_ctx->lavf_ctx->pb); if (ret < 0) { MP_ERR(da, "spdif mux error: '%s'\n", mp_strerror(AVUNERROR(ret))); goto done; }
out = mp_aframe_new_ref(spdif_ctx->fmt); int samples = spdif_ctx->out_buffer_len / spdif_ctx->sstride; if (mp_aframe_pool_allocate(spdif_ctx->pool, out, samples) < 0) { TA_FREEP(&out); goto done; }
uint8_t **data = mp_aframe_get_data_rw(out); if (!data) { TA_FREEP(&out); goto done; }
memcpy(data[0], spdif_ctx->out_buffer, spdif_ctx->out_buffer_len); mp_aframe_set_pts(out, pts);
done: talloc_free(mpkt); if (out) { mp_pin_in_write(da->ppins[1], MAKE_FRAME(MP_FRAME_AUDIO, out)); } else { mp_filter_internal_mark_failed(da); }}
static const int codecs[] = { AV_CODEC_ID_AAC, AV_CODEC_ID_AC3, AV_CODEC_ID_DTS, AV_CODEC_ID_EAC3, AV_CODEC_ID_MP3, AV_CODEC_ID_TRUEHD, AV_CODEC_ID_NONE};
static bool find_codec(const char *name){ for (int n = 0; codecs[n] != AV_CODEC_ID_NONE; n++) { const char *format = mp_codec_from_av_codec_id(codecs[n]); if (format && name && strcmp(format, name) == 0) return true; } return false;}
// codec is the libavcodec name of the source audio codec.// pref is a ","-separated list of names, some of them which do not match with// libavcodec names (like dts-hd).struct mp_decoder_list *select_spdif_codec(const char *codec, const char *pref){ struct mp_decoder_list *list = talloc_zero(NULL, struct mp_decoder_list);
if (!find_codec(codec)) return list;
bool spdif_allowed = false, dts_hd_allowed = false; bstr sel = bstr0(pref); while (sel.len) { bstr decoder; bstr_split_tok(sel, ",", &decoder, &sel); if (decoder.len) { if (bstr_equals0(decoder, codec)) spdif_allowed = true; if (bstr_equals0(decoder, "dts-hd") && strcmp(codec, "dts") == 0) spdif_allowed = dts_hd_allowed = true; } }
if (!spdif_allowed) return list;
const char *suffix_name = dts_hd_allowed ? "dts_hd" : codec; char name[80]; snprintf(name, sizeof(name), "spdif_%s", suffix_name); mp_add_decoder(list, codec, name, "libavformat/spdifenc audio pass-through decoder"); return list;}
static const struct mp_filter_info ad_spdif_filter = { .name = "ad_spdif", .priv_size = sizeof(struct spdifContext), .process = process, .destroy = destroy,};
static struct mp_decoder *create(struct mp_filter *parent, struct mp_codec_params *codec, const char *decoder){ struct mp_filter *da = mp_filter_create(parent, &ad_spdif_filter); if (!da) return NULL;
mp_filter_add_pin(da, MP_PIN_IN, "in"); mp_filter_add_pin(da, MP_PIN_OUT, "out");
da->log = mp_log_new(da, parent->log, NULL);
struct spdifContext *spdif_ctx = da->priv; spdif_ctx->log = da->log; spdif_ctx->pool = mp_aframe_pool_create(spdif_ctx); spdif_ctx->public.f = da;
if (strcmp(decoder, "spdif_dts_hd") == 0) spdif_ctx->use_dts_hd = true;
spdif_ctx->codec_id = mp_codec_to_av_codec_id(codec->codec);
if (spdif_ctx->codec_id == AV_CODEC_ID_NONE) { talloc_free(da); return NULL; } return &spdif_ctx->public;}
const struct mp_decoder_fns ad_spdif = { .create = create,};